JP2004110399A - Image display program and image display device - Google Patents

Abstract

An object of the present invention is to enable security information attached to data displayed as an index image to be immediately predicted just by visually recognizing the index image displayed by a user.
A data reading unit that reads a file in a plurality of computers; an index image generating unit that generates an index image of the file; a computer image generating unit that generates an image of a computer from which the data is read; An image display control unit 25 for displaying a computer image on the display 7 and a selected image recognition unit 24 for recognizing a computer image selected from the displayed computer images, wherein the selected image recognition unit 24 When recognizing the image, the image display control unit 25 causes the display 7 to display the index image of the file in the computer together with the computer image.
[Selection] Fig. 2

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image display technique for generating an index image of data recorded on a recording medium and displaying the index image on a display screen.
[0002]
[Prior art]
Conventionally, for document data and image data recorded on a recording medium such as a hard disk or an optical disk in a computer, an index image (thumbnail image) of a reduced size of each image is created, and the generated index image is displayed on a display screen. There are known image display devices and image display programs for displaying the images in a list. In such an image display device and an image display program, for example, when a desired folder is designated from among a plurality of folders stored in a hard disk of a computer, an index image of each file stored in the folder is listed. Is displayed. At this time, in the case of document data, the image of the first page is displayed in a reduced size, and in the case of image data, the image is displayed in a reduced size. Thus, if the user looks at the index image, the contents of the file can be grasped to some extent without opening the file.
[0003]
[Problems to be solved by the invention]
However, when a list of index images of a file is displayed by the image display device and the image display program, the user can grasp the contents of the file by looking at the index image, but can freely change, read, and write the file. It is not possible to immediately determine whether or not so-called security information is added. In order for the user to know the security information, whether or not the file can be changed, read, written, etc. is determined by whether the user actually tries to change the file contents, etc. Operation must be performed.
[0004]
The present invention has been made in order to solve the above-described problems, and an image display that can immediately predict security information of data displayed as an index image by simply viewing the index image displayed in a list. It is an object to provide a program and an image display device.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 provides an image display program for causing a computer to generate an index image of data recorded on a recording medium and to display the index image on a display.
Data reading means for reading data in each recording medium of a plurality of computers;
Index image generating means for generating an index image for the data read by the data reading means,
Computer image generating means for generating an image indicating a computer which is a target of data reading by the data reading means,
Image display control means for displaying each computer image generated by the computer image generation means on a display screen,
Among the computer images displayed on the display screen, while functioning as recognition means for recognizing which computer image was selected,
When any one of the computer images is recognized by the recognition unit, the image display control unit displays an index image of data in a recording medium of the computer corresponding to the computer image together with the computer image indicating the computer. It is to be displayed on the screen.
[0006]
The invention according to claim 7 is an image display device that generates an index image of data recorded on a recording medium and displays the index image on a display.
Data reading means for reading data in each recording medium of a plurality of computers;
Index image generating means for generating an index image for the data read by the data reading means,
Computer image generating means for generating an image indicating a computer which is a target of data reading by the data reading means,
Image display control means for displaying each computer image generated by the computer image generation means on a display screen,
Recognizing means for recognizing which computer image was selected among the computer images displayed on the display screen,
When any one of the computer images is recognized by the recognition unit, the image display control unit displays an index image of data in a recording medium of the computer corresponding to the computer image together with the computer image indicating the computer. It is displayed on the screen.
[0007]
According to these configurations, a plurality of computers from which data is to be read are displayed on the display screen as computer images, and when any one of the computer images is selected, the data stored in the recording medium of the computer is read. Is displayed on the display screen together with the computer image, so that the user can easily recognize which of the plurality of computers from which data can be read is displaying the data recorded on the computer. be able to. Thereby, for example, the user clearly grasps that data recorded on a computer (server computer, etc.) other than the computer (client PC, etc.) operated by the user is displayed, and changes to the data, It is possible to predict that there is a high possibility that restrictions on writing, reading, and the like will accompany.
[0008]
According to a second aspect of the present invention, there is provided an image display program for causing a computer to generate an index image of data recorded on a recording medium and display the index image on a display.
Data reading means for reading data stored in a recording medium of a computer and security level information accompanying the data,
Based on the data and security information read by the data reading means, an index image generating means for generating, for each piece of data, an index image that differs according to a security level;
The computer functions as image display control means for displaying the index image generated by the index image generation means on a display screen.
[0009]
The invention according to claim 8 is an image display device that generates an index image of data recorded on a recording medium and displays the index image on a display.
Data reading means for reading data stored in a recording medium of a computer and security level information accompanying the data,
Based on the data and security information read by the data reading means, an index image generating means for generating, for each piece of data, an index image that differs according to a security level;
Image display control means for displaying the index image generated by the index image generation means on a display screen.
[0010]
According to these configurations, the index image generated according to the data and the security level in the recording medium of the computer is displayed on the display screen, so that the user can perform a special operation only by visually recognizing the index image. Without doing this, it is possible to immediately grasp the contents of the data and the associated restriction information such as change, read, and write.
[0011]
According to a third aspect of the present invention, there is provided the image display program according to the first aspect, wherein the data reading means acquires security level information accompanying data in the recording medium,
The index image generating means generates, for each data, an index image that differs according to a security level based on the data and the security information read by the data reading means,
The image display control means causes a computer to function so as to display the index image generated by the index image generation means on a display screen.
[0012]
According to this configuration, among the computers from which data can be read, the user can easily recognize which computer data is displayed on the display screen, and furthermore, the user can display the data on the display screen. By visually recognizing the index image displayed above, it is possible to immediately grasp the contents of the file and the accompanying restriction information such as change, reading, and writing.
[0013]
According to a fourth aspect of the present invention, there is provided the image display program according to the second or third aspect, wherein the security information can be set for each folder on the recording medium.
The image display control unit changes the index image array of each file in the folder according to the content of the security information attached to the folder in the recording medium read by the data reading unit, and displays the index image on the display screen. The computer is made to function so as to be displayed.
[0014]
According to this configuration, the arrangement of the index images of each file in the folder is changed and displayed on the display screen according to the contents of the security information attached to the folder, so that the user can change the arrangement state of the index images. By looking at the contents, the contents of the security information attached to each file can be predicted.
[0015]
According to a fifth aspect of the present invention, there is provided the image display program according to the fourth aspect, wherein the image display control means determines that the security information set in the folder indicates a high security level. The computer functions so that the index images of the files in the folder are arranged and displayed on the display screen.
[0016]
According to this configuration, by displaying the index image group arranged and displayed to the user, each file is under strict management, and each file must not be read without permission or the contents cannot be changed. Such an impression can be expected to be given to the user. Therefore, the security information of each file can be predicted while the user has interest.
[0017]
According to a sixth aspect of the present invention, there is provided the image display program according to the fourth or fifth aspect, wherein the image display control means determines that the security information set in the folder has a low security level. Indicates that an index image of each file in the folder is displayed on the display screen in an unaligned state.
[0018]
According to this configuration, each file is not managed by showing the index image group that is not aligned, that is, displayed in a disturbed state because the files are not aligned, so that reading of each file and change of contents can be performed. It can be expected that the user will be given an impression that he or she can go freely. Therefore, the security information of each file can be predicted while giving the user interest.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of an image display device and an image display program according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of an image display device according to the present invention. The image display device 1 shown in FIG. 1 includes a personal computer and the like. The image display device 1 includes a CPU 2 that controls the operation of the entire device. The input device 3, the ROM 4, the RAM 5, the storage device 6, the display 7, and the recording medium reading device 8 are connected to the CPU 2 via an internal bus. . Under the control of the CPU 2, various data are input and output between the components via an internal bus, and various processes are executed.
[0020]
The input device 3 includes a keyboard, a mouse, and the like, and an operation instruction or the like is input by a user. The ROM 4 stores a system program and the like for controlling the operation of the entire apparatus. The storage device 6 is composed of a hard disk drive or the like, and stores an image display program and the like according to the present invention. The CPU 2 reads an image display program or the like from the storage device 6, executes the processing, and controls the operation of each block. The RAM 5 is used as a work area of the CPU 2. The display 7 includes a CRT or a liquid crystal display device, and displays various screens under the control of the CPU 2.
[0021]
The image display program may be recorded in a storage device 6 from a recording medium 9 such as a CD-ROM or FD by a recording medium reading device 8 including a disk drive or the like. When the image display device 1 is connected to another computer or the like via a network, an image display program or the like may be downloaded from the computer or the like via the network.
[0022]
Next, main functions of the image display device 1 configured as described above will be described. FIG. 2 is a main functional block diagram of the image display device 1. As shown in FIG. 2, in the image display device 1, the CPU 2 functions as a program execution unit according to an image display program stored in the storage device 6. Document data 1, 2, and 3 in text format and the like and image data 1 to n in PDF format and JPEG format stored in the storage device 6 are to be read. Note that the document data and image data to be read may be data stored in the recording medium 9. For the document data and image data read from the storage device 6, an index image (thumbnail image) whose content is reduced to a predetermined size is generated by the CPU 2, and the index image is temporarily transferred to the RAM 5 functioning as an image memory. It is displayed on the display 7.
[0023]
The CPU 2 records the data in its own personal computer (client PC or the like) and another computer 11 (database server or the like) connected to the computer by a LAN or the like based on the instruction of the image display program in the storage device 6. A data reading unit 21 for reading file data (document data, image data, etc.) and security level information associated with each file, and for each security level based on the file data and security information read by the data reading unit 21. An index image generating unit 22 for generating an index image different for each data, a computer image generating unit 23 for generating a computer image indicating a computer from which the data reading unit 21 can read data, and displaying on a screen of the display 7 Sa A selected image recognizing unit 24 for recognizing which computer image has been selected from the computer images, and a computer corresponding to the image recognized by the selected image recognizing unit 24 are specified and recorded on the computer. It functions as an image display control unit 25 for displaying the index image of the file present on the screen of the display 7 together with the computer image.
[0024]
The data reading unit 21 is configured to store document data or images stored in the storage device 16 (or the recording medium 19) such as the database server 11 connected to the computer (image display device 1) via the interface 10. The file data and the security level information attached to the file are read from the data or the like. The computer image generation unit 23 determines a computer to be read by the data reading unit 21 (such as its own computer and a database server connected thereto) based on the ID information of each computer acquired by the data reading unit 21 to be described later. A tab image as shown in FIG. 4 is generated. Image data necessary for generating the tab image is stored in an image data storage unit in the image display program.
[0025]
The index image generation unit 22 generates index images different for each security level by using image data (corresponding to the security level) stored in the image data storage unit in the image display program. In the image data storage unit, for example, when the security level is read-only, write-only, changeable, and full control (no restrictions such as write change), different display forms, such as colors or Symbol image data is prepared in association with each other (see FIG. 6 described later). The intex image 22 combines this image data with an image obtained by processing the contents of a file into a reduced image to generate an index image.
[0026]
Next, a process for displaying both a user's personal computer (image display device 1) and files stored in a database server connected to the computer on the personal computer will be described. FIG. 3 is a flowchart showing the process, and FIG. 4 is a diagram showing a display example on the screen of the display 7.
[0027]
When displaying both the data (folder and file) stored in the personal computer and the database server on the display 7 of the personal computer, the CPU 2 can browse the internal data from the personal computer by LAN connection or the like. A proper computer is confirmed (S1). Then, by referring to the name information from the ID information of the computer capable of browsing the internal data, a tab image displaying a computer capable of browsing the internal data is generated (S2). For example, when the internal data of the shared database server can be viewed from the personal computer, a tab image indicating the user's personal computer and the database server is generated. These tab images are displayed on the display 7 (S3). At this time, as shown in FIG. 4, a tab image indicating one computer is displayed over the other tab image.
[0028]
Then, as shown in FIG. 4, for example, a folder list in the computer displayed on the upper side of the two tab images displayed in an overlapping manner is displayed (S4), and the list is displayed. For one of the folders, an index image of each file in the folder is generated, and a file list is displayed (S5).
[0029]
Here, from the tab images displayed on the display 7, it is determined that a tab image indicating a computer different from the computer displaying the file list is selected by the user's mouse operation or the like. Is recognized (YES in S6), the superimposed display of both tab images is exchanged, and the display of the tab image indicating the selected computer is superimposed on the other tab display, and is stored in the selected computer. In addition to displaying a list of folders (S7), for any one of the folders, an index image of each file in the folder is generated, and a file list is displayed (S8). Thereafter, the processing of S6 to S8 is repeated.
[0030]
This allows the user to easily recognize which of the computers from which data can be read from the personal computer is displayed in which computer. Therefore, the user is required to clearly understand that data recorded on a computer other than his / her computer is displayed, and the data is likely to be accompanied by restrictions on changes, writing, reading, and the like. Can be predicted.
[0031]
Next, a process of displaying a list of index images different for each security level of each file will be described. FIG. 5 is a flowchart showing the process, and FIGS. 6A to 6D are diagrams showing an example of the index image.
[0032]
When displaying a different index image for each security level of each file, the CPU 2 checks the security level of each file from the security information attached to the file (S11). If any security (restriction on reading, writing, etc.) is set for the file (YES in S12), the image data corresponding to the security level is read from the image data storage unit in the image display program (S13).
[0033]
The image data corresponding to the security level stores data of an image that is different according to the security level. For example, if security levels 1: read-only, security level 2: write-only, security level 3: changeable, and security level 4: full control (no change in writing or the like) are prepared, security level 1 Is a triple frame (FIG. 6 (a)) that suggests that the user has the most restrictions, a security level 2 is a double frame (FIG. 6 (b)), and a security level 3 is that the user has few restrictions. Data of each image such as a single frame (FIG. 6C) to be associated is stored. FIGS. 6A to 6C show index images obtained by synthesizing an image indicating the security level and a thumbnail image indicating the file content. Further, the color of the index image may be made different depending on the security level without depending on the image displaying the frame as described above.
[0034]
After reading the image data corresponding to the security level, the data of the file is read (S14), and an index image is generated by combining the image data corresponding to the security level and the file data (S15).
[0035]
If it is determined in S12 that no security is set for the file and that the file is a so-called fully controllable file (NO in S12), without reading out the image data corresponding to the security level, Only the data of the file is read (S18), and an index image as shown in FIG. 6D is generated based on the file data (S19).
[0036]
Thereafter, the generated index image data is transferred to the RAM 5 (image memory) (S16), and the index image is displayed on the display 7 (S17). The above process is performed for all files recorded on the recording medium.
[0037]
If the index image is generated and displayed in this manner, the user can view, change, read, and modify the file without performing any special operation or the like for obtaining security information attached to the file. Security information as to whether writing or the like is possible can be immediately grasped.
[0038]
Next, display processing according to the presence / absence of the security setting of the folder will be described. FIG. 7 is a flowchart showing the processing, FIG. 8 is a diagram showing an example of a screen displaying a list of index images of each file for a folder for which security is set, and FIG. FIG. 9 is a diagram illustrating an example of a screen displaying a list of index images of a file.
[0039]
In the case where the images indicating the folders are displayed differently on the screen of the display 7 according to the presence or absence of the security setting of each folder, the CPU 2 checks the security level of each folder based on the security information attached to the folder. (S21). If some security is set for the folder (YES in S22), the color of the image indicating each folder for displaying a folder list by so-called tree display is set to, for example, red (S23). That is, in order to clearly indicate that there is a restriction on the handling of the folder, the image is displayed in a color different from that of the folder for which security is not set.
[0040]
Subsequently, it is determined whether or not the file is selected by a user's mouse operation or the like (S24). If the folder is selected (YES in S24), an index image of each file in the folder is displayed. The background color of the target area is set to, for example, red (S25). That is, it is clearly displayed that each displayed file is stored in a folder for which security is set.
[0041]
Then, as shown in FIG. 8, index images indicating the files in the folder are arranged and set (S26, see FIG. 8). The data of the aligned index image and the desktop background image is transferred to the image memory (RAM5) (S27), and the index image in the image memory is displayed on the display 7 (S28). If the folder has not been selected by the user (NO in S24), S25 and S26 are skipped, and the process ends.
[0042]
If the security setting is not set for the folder in S22 (NO in S22), the image indicating the folder for displaying the folder list by the tree display is set to a normal color (for example, beige) (S29). That is, in order to provide a display difference from a folder for which security is set, the folder is displayed in a color different from that of the folder for which security is set.
[0043]
Subsequently, when the folder is selected by a user's mouse operation or the like (YES in S30), the background color of the area for displaying each file in the folder is set to a normal color such as white (S31). That is, in order to clearly indicate that each displayed file is stored in a folder for which security is not set, the file is displayed in a color different from that in the case where security is set.
[0044]
Then, as shown in FIG. 9, the index images indicating the files in the folder are arranged in a disordered state without being aligned and arranged (S32). In this case, for example, the position of each index image is determined by operating the random number generation means for each display, and determining the display position and the priority of overlapping based on the prepared arrangement information corresponding to the obtained random number. Just fine. The data of the index image and the desktop background image is transferred to the image memory (RAM5) (S27), and the index image in the image memory is displayed on the display 7 (S28). If the folder has not been selected (NO in S30), S31 and S32 are skipped, and the process ends.
[0045]
When displaying a folder image of a different color for each security level of a folder, the following processing is performed. FIG. 10 is a flowchart showing the process. A description of the same processes as those shown in FIG. 7 will be omitted. In this process, when some security is set for the folder (YES in S42), the level of the security level is further confirmed (S47), and the folder image for list display is displayed according to the security level set for the folder. (S48, S51, S57). For example, if security level 1: read-only, the folder image for tree list display is set to red (S48), and if security level 2: write-only, the folder image for tree list display is set to yellow (S51). ), Security level 3: if changeable, the folder image for displaying the tree list is set to green (S57).
[0046]
Also, the background color of the area for displaying the index image of each file in the folder is set to a different color according to the security level, similarly to the color of the folder image (S50, S53, S59).
[0047]
In this way, by displaying the folder image and the desktop background in different colors according to the security level, the user can immediately know the security level of each folder.
[0048]
Note that the present invention is not limited to the configuration of the above embodiment, and various modifications are possible. For example, a process of displaying both the personal computer and the file stored in the database server on the personal computer (FIG. 3), and a process of displaying a list of index images that differ depending on the security level of each file ( 5) may be performed, and a screen as shown in FIG. 11 may be displayed on the display 7. In this case, the user can easily recognize which computer's file (index image) is displayed on the display 7, and when the user visually recognizes the index image, the contents of the file and the accompanying file are displayed. Restriction information such as change, read, and write can be immediately grasped.
[0049]
Further, the arrangement in which the index images of the files in the folder for which security is not set are arranged without being aligned is not limited to the one shown in FIG. 9 described above, and as shown in FIG. It may be displayed so that it is displayed as if it were overlapped, and a document is left in a pseudo manner. In this case, the arrangement of the index images and the degree of overlap between the index images may be determined at each display based on a predetermined random number, at the display position and the overlapping area.
[0050]
In the above embodiment, the color of the folder image for displaying the tree list is set to red, yellow, and blue for each security level set for the folder. However, the colors are not limited to these colors. It is.
[0051]
【The invention's effect】
As described above, according to the first and seventh aspects of the present invention, a plurality of computers from which data is to be read are displayed on a display screen as computer images, and when one of the computer images is selected, Since the index image of the data in the recording medium of the computer is displayed on the display screen together with the computer image, it is possible to determine which of the plurality of computers from which data can be read out displays the data recorded on the computer. Can be easily recognized by the user. Thereby, for example, the user clearly understands that data recorded on a computer (server computer or the like) other than the computer (client PC or the like) operated by the user is displayed, and changes the data to the data. , It is possible to predict that there is a high possibility that restrictions on writing, reading and the like will accompany.
[0052]
According to the second and eighth aspects of the present invention, the index image generated based on the data in the recording medium of the computer and the security information is displayed on the display screen. The user can immediately grasp the contents of the data and the associated restriction information such as change, reading, writing, etc., without performing a special operation by just visually recognizing.
[0053]
According to the third aspect of the present invention, the user can easily recognize which computer data is displayed on the display screen in a computer from which data can be read. Moreover, by visually recognizing the index image displayed on the display screen, the user can immediately grasp the contents of the file and the accompanying restriction information such as change, read, and write.
[0054]
According to the fourth aspect of the invention, the arrangement of the index images of the files in the folder is changed and displayed on the display screen according to the security information attached to the folder. Based on the arrangement state of the images, the contents of the security information attached to each file can be predicted.
[0055]
According to the fifth aspect of the present invention, by displaying the index image group arranged and displayed to the user, each file is under strict control, and each file is read without permission, It can be expected that the user will be given an impression that it should not be changed. That is, the security information of each file can be predicted while the user has interest.
[0056]
According to the invention described in claim 6, each file is not managed by displaying the index image group displayed in a disordered state without being aligned, so that reading of each file and contents of each file are not performed. It can be expected that the user gives an impression that the user can freely make changes and the like. That is, the security information of each file can be predicted while the user has interest.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of an image display device according to the present invention.
FIG. 2 is a main functional block diagram of the image display device according to the present invention.
FIG. 3 is a flowchart showing a process for displaying both a personal computer and a file stored in a database server connected to the computer on the personal computer.
FIG. 4 is a diagram showing an example of a screen display in a case where processing for displaying both a personal computer and a file stored in a database server connected to the personal computer on the personal computer is performed.
FIG. 5 is a flowchart illustrating a process of displaying a list of index images that differ according to the security level of a file.
FIGS. 6A to 6D are diagrams illustrating examples of index images that are changed according to the security level of a file.
FIG. 7 is a flowchart showing a display process according to the presence / absence of security setting of a folder.
FIG. 8 is a diagram illustrating an example of a screen for displaying a list of index images of each file in a folder for which security setting is performed.
FIG. 9 is a diagram illustrating an example of a screen for displaying a list of index images of each file in a folder for which security setting has not been performed;
FIG. 10 is a flowchart illustrating a process of displaying a folder image of a different color for each security level of a folder.
FIG. 11 shows a process for displaying both a personal computer and a file stored in a database server connected to the personal computer on a personal computer, and displays a list of index images that differ according to the security level of each file. FIG. 7 is a diagram showing an example of a screen display when both processes are performed.
FIG. 12 is a diagram illustrating another example of a screen for displaying a list of index images of each file in a folder for which security setting is not performed.
[Explanation of symbols]
1 Image display device
6 Storage device
7 Display
9 Recording media
21 Data reading section
22 Index image generation unit
23 Computer Image Generator
24 Selected image recognition unit
25 Image display control unit

Claims (8)

In an image display program for causing a computer to generate an index image of data recorded on a recording medium and display the index image on a display, the computer includes:
Data reading means for reading data in each recording medium of a plurality of computers;
Index image generating means for generating an index image for the data read by the data reading means,
Computer image generating means for generating an image indicating a computer which is a target of data reading by the data reading means,
Image display control means for displaying each computer image generated by the computer image generation means on a display screen,
Among the computer images displayed on the display screen, while functioning as recognition means for recognizing which computer image was selected,
When any one of the computer images is recognized by the recognition unit, the image display control unit displays an index image of data in a recording medium of the computer corresponding to the computer image together with the computer image indicating the computer. An image display program characterized by being displayed on a screen. In an image display program for causing a computer to generate an index image of data recorded on a recording medium and display the index image on a display,
Data reading means for reading data stored in a recording medium of a computer and security level information accompanying the data,
Based on the data and security information read by the data reading means, an index image generating means for generating, for each piece of data, an index image that differs according to a security level;
An image display program for causing a computer to function as image display control means for displaying an index image generated by the index image generation means on a display screen. The data reading unit acquires security level information accompanying data in the recording medium,
The index image generating means generates, for each data, an index image that differs according to a security level based on the data and the security information read by the data reading means,
The computer-readable storage medium according to claim 1, wherein the image display control unit causes a computer to function so as to display the index image generated by the index image generation unit on a display screen. When security information can be set for each folder on the recording medium,
The image display control unit changes the array of index images of each file in the folder according to the content of security information attached to the folder in the recording medium read by the data reading unit, and displays the index image on the display screen. The image display program according to claim 2, wherein the image display program causes a computer to function so as to be displayed. When the security information set in the folder indicates that the security level is high, the image display control means arranges the index images of the files in the folder in order to display them on a display screen. 5. The image display program according to claim 4, wherein When the security information set in the folder indicates that the security level is low, the image display control means displays the index images of the files in the folder on the display screen in an unaligned state. 6. The image display program according to claim 4, wherein the program causes a computer to function. In an image display device that generates an index image of data recorded on a recording medium and displays the index image on a display,
Data reading means for reading data in each recording medium of a plurality of computers;
Index image generating means for generating an index image for the data read by the data reading means,
Computer image generating means for generating an image indicating a computer which is a target of data reading by the data reading means,
Image display control means for displaying each computer image generated by the computer image generation means on a display screen,
Recognizing means for recognizing which computer image was selected among the computer images displayed on the display screen,
When one of the computer images is recognized by the recognition unit, the image display control unit displays an index image of data in a recording medium of the computer corresponding to the computer image together with the computer image indicating the computer. An image display device for displaying on a screen. In an image display device that generates an index image of data recorded on a recording medium and displays the index image on a display,
Data reading means for reading data stored in a recording medium of a computer and security level information accompanying the data,
Based on the data and security information read by the data reading means, an index image generating means for generating, for each piece of data, an index image that differs according to a security level;
An image display control unit for displaying an index image generated by the index image generation unit on a display screen.

Images