JPH11184704A - Server client system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of times of down-load, to shorten a program executing time, and to shorten an access time in a server. SOLUTION: This system is provided with a client 10 having a save medium 12 with a small capacity for storing data or the like, and a save managing mechanism 13 for issuing a down-load request to a server 20 when data necessary for the execution of an execution program 11 are not present in the save medium. Also, this system is provided with a server 20 having a structure managing table 21 for managing the structure of the execution program, low speed access storage medium 22 for storing data necessary for the execution of the execution program, high speed storage medium 23 capable of high speed access, and save managing mechanism 24 for preliminarily referring to the structure of the execution program of the structure managing table, transferring data to be down-loaded from the storage medium 22 to the storage medium 23, and reading and down-loading the data from the storage medium 23 when a down- load request is present.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a server-client system in which a client downloads necessary subprograms and data from a server and executes predetermined processing.

[0002]

2. Description of the Related Art Conventionally, in a diskless client, a program body handled on the client side is stored in a state in which the size of the program body is limited to a size corresponding to the memory capacity of the client side as much as possible, and data necessary for executing the program body is stored in the server each time. It has been obtained by downloading from the side.

If the program main body cannot fit in the memory on the client side, the program main body is divided into subprograms, and the subprograms are stored on an external disk on the server side. Then, whenever necessary, a subprogram or data is downloaded from the server side, and a predetermined process is executed according to the program body.

[0004]

Therefore, in the server / client system as described above, when the client needs data other than the sub-program and the program, the client always downloads the data from the server side. Takes time to execute.

[0005] Further, since the storage of programs and data on the server side is usually stored on an external disk, it takes time to read from the external disk, the number of downloads increases, and the execution performance of the program increases. There is a problem of drastic reduction.

The present invention has been made in view of the above circumstances, and has as its object to provide a client that reduces the number of downloads and the execution time of a program. Another object of the present invention is to provide a server that reduces the access time of programs and data.

Another object of the present invention is to provide a server / client system which realizes a reduction in access time of a server program and data, a reduction in the number of downloads to a server by a client, and a reduction in program execution time. It is in.

Another object of the present invention is to provide a client-side storage management recording medium in which a program for reducing the number of downloads and shortening the program execution time is recorded. Further, another object of the present invention is to provide
It is an object of the present invention to provide a server-side storage management recording medium in which a program for reducing a program and data access time is recorded.

[0009]

In order to solve the above problems, according to the present invention, when executing an execution program, a subprogram and data are stored as a client which downloads and executes a subprogram and data from a server. It is determined whether or not the storage medium having the minimum storage capacity to be executed and the subprogram or data necessary for executing the execution program exist in the storage medium, and when the storage program does not exist, a download request is made to the server. Storage management means.

[0010] By taking the above measures, the storage management means checks whether the subprogram or data necessary for execution of the execution program exists in the storage medium having a small storage capacity. Since the download request is sent to the server only when not performed, the number of downloads can be reduced, and the execution time of the program can be shortened.

In another invention, in addition to the storage medium and the storage management means, when there is no data including the subprogram in the storage medium, the subprogram and the data in the storage medium are stored in a predetermined order. It is provided with a data discarding means for storing a subprogram and data which are deleted and downloaded from the server.

By taking such means, in addition to reducing the number of downloads, shortening the execution time of the program, the data discarding means discards the subprogram and data in the storage medium in chronological order and downloads them from the server. Since subprograms and data are stored, even a storage medium having a small storage capacity can sufficiently store subprograms and data necessary for executing an execution program.

According to another aspect of the present invention, in a server for downloading a subprogram or data based on a request from a client, a structure management table for storing and managing the structure of an execution program on the client side; A sub-program necessary for execution of the program, a data storage medium for storing data, and upon receiving a download request from the client, download the corresponding sub-program or data and refer to the structure of the execution program in the structure management table. And a storage management means for determining a subprogram and data to be downloaded next, and setting the data in a state capable of responding to the next download request.

By taking such means, the storage management means determines the subprogram or data requested next by the client while referring to the structure of the client's execution program stored in the structure management table. , You can create an instant downloadable state.

According to another aspect of the present invention, there is provided a low-speed storage medium for storing a sub-program and data required for executing a client-side execution program in addition to a structure management table, a high-speed storage medium for high-speed access, When a download request is received from a client, a prefetch function for downloading the corresponding subprogram or data, prefetching the subprogram or data to be downloaded next from the structure of the execution program in the structure management table, and storing the read subprogram or data in the high-speed storage medium Since a storage management means having a subprogram or data is provided, and when a download request is received from a client, a high-speed storage medium is immediately accessed and the corresponding subprogram or data is downloaded, the access time of the program and data can be reduced.

Still another aspect of the present invention is to combine a client having the above-described means with a server, so that a client can reduce the number of downloads, reduce the execution time of a program, and effectively use a storage medium having a small storage capacity. It is also possible to shorten the access time of programs and data in the server.

Further, in another invention, when executing the execution program, the first subprogram downloaded from the server based on the download request is stored in the storage medium in the storage management computer on the client side that executes the execution program. An execution notification function for storing and sending an execution notification to the server when the first subprogram is started and executed, and a request target determination function for determining a request target during or after execution of the first subprogram When it is a request for the second subprogram or data from the determination result of the request target determination function, it is checked whether the request target exists in the storage medium. Acquires a request for the size of the request, and determines whether there is an empty area corresponding to this size in the storage medium. A program for realizing an area confirmation function for confirming the subprogram and a discard function for erasing data and downloading the request target in a predetermined order when there is no free area corresponding to the size in the storage medium. By having the recorded recording medium, the request target is determined during or after the execution of the first subprogram, and when the request is for the second subprogram or data, it is determined whether or not the request exists in the storage medium. If there is, by performing a predetermined process using the second subprogram or data, the number of downloads can be reduced, and the execution time of the program can be reduced.

If the second subprogram or data does not exist in the storage medium, a request for the size of the request is obtained from the server, and if there is no free area corresponding to this size in the storage medium, the subprograms are ordered from oldest to newest. Since the data is discarded and the requested object is stored, the minimum necessary storage medium can be effectively used.

Further, in another invention, when a download request for the first subprogram is received by a server-side storage management computer that downloads a request target in response to a download request from a client, the storage program is stored in a storage medium. A program download function for downloading a first subprogram among subprograms and data to be executed, and a structure management table for storing the structure of the execution program when a notification of execution of the first subprogram is received from a client And a confirmation function for confirming the presence or absence of lower data relating to the first subprogram or the presence of the second subprogram, and when confirming that there is lower data, transferring the lower data stored in the storage medium to a high-speed storage medium. Transfer, and that there is a second subprogram A transfer function for transferring the second subprogram stored in the storage medium to the high-speed storage medium when it is recognized, and, when receiving a download request from the client, transferring lower-order data of the high-speed storage medium or the second subprogram. By having a server-side storage management recording medium recording a program for realizing a high-speed download function to download, when receiving a download request from a client, lower-level data or a subprogram can be immediately downloaded from the high-speed storage medium, Access time for programs and data can be reduced.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a server / client system according to the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing one embodiment of a server / client system.

This system is a system having no disk, such as an STB (Set Top Box), and a client 10 which downloads necessary data from a server side and executes predetermined processing according to an execution program. The server 20 holds various programs and data to be provided to the client side, and downloads necessary programs and data in response to a download request from the client side.

The client 10 includes an execution program 11 for executing predetermined processing on the client side,
A storage medium 12 having a minimum necessary storage capacity for storing programs, data, and the like, and a storage management mechanism 13 for executing the execution program 11 and confirming the presence or absence of programs and data on the storage medium 12 are configured. I have.

The execution program 11 is an interactive program. In executing this program, necessary data is downloaded from the server 20 in response to a user's request, and is displayed on a screen of a CRT display device (not shown). Displays images, text information, still images, moving images, etc.

The storage medium 12 is, for example, a RAM, an RO,
M, etc., is connected to the storage management mechanism 13 and has a function of storing the minimum necessary programs and data other than the programs. Here, the necessary minimum storage capacity means the storage capacity required to store, for example, two or three of the largest subprograms and data among the subprogram and data sizes. However, it is assumed that the storage capacity further changes according to the user's request. In some cases, a storage capacity may be required to store all data B to D below a certain subprogram A.

The storage management mechanism 13 checks whether or not the subprogram or data exists in the storage medium 12 during execution of the execution program 11 or when receiving a subprogram or data download request instruction from the user. When there is no corresponding program or data, a download request is sent to the server 20. That is, the storage management mechanism 13 has a subprogram and data confirmation function. When receiving a download request instruction, the storage management mechanism 13 checks whether a program or data exists in the storage medium 12 and checks the subprogram and data. When there is no data, a download request is made to the server 20.

On the other hand, the server 20 includes a structure management table 21 for managing the structure of the substantial execution program on the client 10 side, a storage medium 22 capable of low-speed access, a storage medium 23 capable of high-speed access, The storage management mechanism 24 refers to the subprogram structure of the table 21, prefetches the next required subprogram and data, and transfers and stores the subprogram or data from the storage medium 22 to the storage medium 23. .

The structure management table 21 describes a related structure of data including a subprogram required in the execution program 11. The related structure has a hierarchical structure in units of the types of programs and data necessary for executing the execution program 11.

The storage medium 22 is connected to the storage management mechanism 24 and stores programs and data necessary for executing the execution program 11. The storage medium 22 is, for example, a magnetic disk, DVD, CD
-ROM, magnetic tape, etc. are used.

The high-speed storage medium 23 is a storage management mechanism 2
4 for storing programs and data read from the storage medium 22, particularly a high-speed readable storage medium.

The storage management mechanism 24 has a prefetch mechanism, refers to the program structure described in the structure management table 21, and prefetches the next requested program and data before receiving a download request from the client 10. In addition, it has a function of reading data including the program from the storage medium 22 and storing the data in the high-speed storage medium 23.

FIG. 2 is a diagram for explaining the execution order of the execution program 11. The execution program 11 is composed of a plurality of sub-programs A, F, and G. Of the sub-program A, a still image B and a button E are downloaded from the server 20 by execution and displayed on a screen of a CRT display device. The moving image C and the sound D are downloaded from the server 20 and displayed.

Here, whether the user designates button E,
Alternatively, when the user operates the remote control numeral of the STB, for example, "1" and instructs the next screen display or the like, the subprogram F is downloaded from the server 20, and the still image H, the moving image I, Voice J
Are sequentially downloaded, displayed on the screen of the CRT display device, and sound J is output.

On the other hand, STB
Is operated, the subprogram G is downloaded and displayed on the CRT display device in the same manner as the subprogram F.

The subprogram F is composed of a still image H, a moving image I, a sound J, a subprogram K, and the like. Next, FIG. 3 shows a structure management table 21 for managing the structure of the substantial execution program on the client 10 side.
FIG. 4 is a diagram for explaining the storage contents of the. As shown in the figure, the program and data for executing the execution program 11 are in the form of a hierarchical structure (see FIG. 1A). FIG.
Shows a description example of the execution program structure.

That is, the data called during the execution of the subprogram A are the still image B, the moving image C, the audio D, and the button E as described above. Execute. Therefore, B, C, D, E, F, and G are described below the subprogram A. The data called during the execution of the subprogram F is a still image H, a moving image I, a sound J, and a subprogram K. Therefore, the data is described below the subprogram F in the order of H, I, J, and K. I have.

Next, the operation of the above system will be described. When receiving an instruction to execute the execution program 11 from the user, the storage management mechanism 13 executes the execution program 1
1 is instructed to the server 20 to download the subprogram A required for the execution of Step 1. This is because programs and data often do not exist in the storage medium 12 at an early stage.

In the server 20, the storage management mechanism 24 receives the request for downloading the subprogram A,
And reads the subprogram A from the client 10 and downloads it to the client 10.

Here, the client 10 is connected to the server 20
Subprogram A downloaded from the storage medium 1
2, the subprogram A is started and executed by the OS, and the execution of the subprogram A is
Notify. Upon receiving the execution notification of the subprogram A, the storage management mechanism 24 of the server 20 determines from the structure of the execution program in the structure management table 21 that the next request target is a still image B (hereinafter, referred to as data B). Then, the data B is transferred from the storage medium 22 to the storage medium 23 and stored.

On the other hand, when the data B is requested at the stage of execution of the subprogram A, the client confirms whether or not the data B is present in the storage medium 12. A predetermined process is executed, but if it does not exist, a download instruction for data B is sent to the server 20 and the data size is received. After a while
The storage management mechanism 13 checks whether the received data size can be stored in the storage medium 12, that is, whether or not there is a free area. If there is no free area, the subprogram or data is deleted from the oldest one, If the area is insufficient, the next old subprogram or data is deleted, and then the data B is downloaded from the server 20 and stored in the storage medium 12.

It is to be noted that the oldest order can be confirmed by writing the data of the writing date and time at the same time when the program or data is stored in advance. Hereinafter, similarly, the subprogram and data are sequentially downloaded according to the structure of the execution program 11 while being transferred to the storage medium 23, and a series of processing is executed.

Therefore, according to the above-described embodiment, when the client 10 needs a subprogram or data in the execution stage of the execution program 11, it checks whether or not the client 10 exists in the storage medium 12, Since the download request is sent to the server 20 only when not performed, the number of downloads can be reduced, and the execution time of the program can be reduced.

Further, the client 10 requests a subprogram or data from the server 20, fetches the data size, checks the free area of the storage medium 12, and if the storage is insufficient, deletes the data in the oldest order. And
Since the downloaded subprogram or data is stored, the storage medium 12 having the minimum necessary storage capacity can be effectively used, and the execution program 11 can be appropriately executed.

In the server 20, the storage management mechanism 24 determines the next program and data to be downloaded from the structure of the execution program in the structure management table 21, and prefetches the data from the storage medium 22 to the high-speed storage medium 23 and stores them. Therefore, the download from the client can be performed at high speed, and the client 10 can execute the program at high speed.

In the present system, as a data discarding mechanism for the storage medium 12 by the storage management mechanism 13 in the client 10, programs and data already stored are erased in chronological order. A counter memory may be provided so that programs and data are deleted and discarded in ascending order of use. In this case as well, the number of times of downloading the program and data can be reduced, which contributes to shortening the program execution time.

Next, an embodiment of the invention relating to a storage medium will be described with reference to FIGS. FIG. 4 is a hardware configuration diagram of a client using the storage management storage medium, FIG. 5 is a hardware configuration diagram of a server using the storage management storage medium, and FIG. 6 is a client storage management computer reading a program of the storage medium. FIG. 7 is a diagram illustrating a series of processing examples performed by a server-side storage management computer reading a program on a storage medium. In these figures, the same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

First, the client 10 has an input unit 16 for inputting instructions and data necessary for executing the program.
In addition to the storage medium 12 such as a CD-ROM, the storage management mechanism 1
A storage management computer 17 having a function equivalent to 3 is provided.

The storage management computer 17 reads a program on the storage management recording medium 18 for recording a program corresponding to the execution program 11, and executes a series of program processing as shown in FIG. 19 is CRT
A display unit that displays various data such as a subprogram, a graphic image, and character information necessary for executing a program stored in the storage management recording medium 18.

On the other hand, the server 20 has a structure management table 21 for managing the structure of the substantial execution program on the client side, a low-speed access storage medium 22, a high-speed access high-speed storage medium 23, and a storage management mechanism 24. A storage management computer 26 having a corresponding function is provided.

The storage management computer 26 reads the program on the storage management recording medium 27 and executes a series of program processing as shown in FIG. The storage management recording media 18 and 27 may be a magnetic tape, a DVD-ROM, a floppy disk, an MO, an MD, a CD-R, a memory card, or the like, in addition to the CD-ROM.

Next, the processing operation of the storage management computer 17 will be described with reference to FIG. The storage management computer 17 reads the program on the storage management recording medium 18 and executes the following processing. That is, the storage management computer 17 on the client side
An initialization process for clearing the contents of the storage medium 12 and the like is performed based on the start when the power is turned on. In this state, when a program execution instruction of the recording medium 18 is received from the input unit 16 (S1), the subprogram A is transmitted to the server 20.
The subprogram A is downloaded from the server 20 and stored in the storage medium 12 by making a download request (S2). The downloaded subprogram A is started as an initial program by a starting mechanism such as an OS (not shown). Here, upon receiving the activation notification of the subprogram A from the activation mechanism (S3), the server 20 is notified of the execution of the program A (S4) (execution notification function).

Therefore, it is determined whether or not a request target, for example, a subprogram or data is required at the execution stage of the subprogram A or after execution (S5) (request target determination function).

Here, if the request target is data, it is confirmed whether or not the request target data exists in the storage medium 12 of the client 10 (S6). If the data exists in the storage medium 12, the pointer of the requested data is returned to the execution program (S11). In this case, the predetermined process is performed using the data stored in the storage medium 12 without making a download request to the server 20, so that the number of downloads is reduced and the data is stored in its own memory. Since data is used, the execution time of the program can be reduced. If the requested data does not exist in the storage medium 12 of the client 10 in step S6, a download request is made to the server 20 for the requested data, and the size data of the requested data is received from the server 20 (S7). Here, the storage management computer 17 checks whether or not the storage medium 12 has a free area corresponding to the received data size (S8).
(Area check function).

If there is no free area corresponding to the data size in the storage medium 12, the oldest data is deleted (S9),
The corresponding request target data is downloaded and stored in the storage medium 12 (S10) (discard function). However, even if the oldest data is deleted, if the area is insufficient, the next oldest data is deleted. Then, the pointer of the stored request target data is returned to the execution program (S11). Step S
8, if there is a free area, the corresponding requested data is similarly downloaded and stored in the storage medium 12 (S1).
0), the same processing is performed (S11).

On the other hand, if the object to be fetched from the subprogram A is a subprogram in step S5, it is determined whether or not the subprogram exists in the storage medium 12 (S21). Is returned to the execution program (S26). Thereafter, the activation mechanism of the client stops the execution of the activated subprogram and activates a new subprogram (S27).
Here, with the execution of the new subprogram started,
The server 20 is notified of the execution of the new subprogram (S28).

If the requested subprogram does not exist in the storage medium 12 in step S21,
The server 20 requests the server 20 to download the requested subprogram, and receives the size of the requested subprogram data from the server 20 (S22) (a request target determination function).

Here, the storage management computer 17 is
It is confirmed whether or not there is a free area corresponding to the data size of the received subprogram in the storage medium 12 (S2).
3) ... (area confirmation function).

If there is no free area equivalent to the data size, the oldest data is deleted from the storage medium 12 (S
24), download the corresponding requested program data and store it in the storage medium 12 (S25) ... (discard function)
The same processing is performed (S26 to S28).

Next, the processing operation of the storage management computer 26 will be described with reference to FIG. The storage management computer 26 reads the program recorded on the recording medium 27 and executes the following series of processing. That is, the storage management computer 26 determines whether or not there is a download request for the sub-program A with the execution of the execution program from the client 10 (S31). If there is a download request for subprogram A, read subprogram A from storage medium 22 and download it to client 10 (S32).
... (program download function).

Thereafter, upon receiving the execution notification of the subprogram A from the client 10 with the activation and execution of the downloaded subprogram A, the storage management computer 26 on the server 20 side receives the structure management table 21.
(S33)... (Confirmation function).

If lower data exists, the lower data is read from the storage medium 22 and
3 and store it. Similarly, when a subprogram exists, the subprogram is read from the storage medium 22, transferred to the high-speed storage medium 23, and stored therein (S34, S3).
5) (Transfer function).

In this state, when there is a download request from the client 10, the request data or request subprogram is read from the high-speed storage medium 24 and downloaded to the client 10 (S36) (high-speed download function).

Further, it is determined whether or not the execution of the program has been completed. If the execution has not been completed, the process returns to step S33, and the same processing is repeatedly executed. Therefore, according to the above embodiment, the client-side storage management computer 17 reads the program on the storage management recording medium 18 and executes the processing shown in FIG. Since a download request is issued to the server only when there is no data or subprogram, the number of downloads can be reduced, and the execution time of the program can be shortened by using the data stored in its own storage medium 12 to execute the program.

Further, the server-side storage management computer 26 reads the program on the storage management recording medium 27 and executes the processing shown in FIG. Since the data is transferred from the low-speed access storage medium 22 to the high-speed accessible storage medium 23, it can be downloaded to the client promptly when a download request is made, which greatly contributes to shortening the execution time of the program in the client.

[0064]

As described above, according to the present invention, the following various effects can be obtained. Claim 1 and Claim 2
According to the invention, the number of downloads on the client side can be reduced, and the program execution time can be reduced.

According to the third and fourth aspects of the present invention,
The data and program requested to be downloaded next are transferred and stored in advance in a storage medium that can be accessed at high speed, and immediately downloaded when a download request is issued. Can be shortened.

According to the fifth aspect of the invention, the effects obtained by the first to fourth aspects of the invention can be obtained. According to the sixth aspect of the present invention, it is possible to provide a client-side storage management recording medium capable of reducing the number of downloads on the client side and shortening the execution time of the program.

According to the seventh aspect of the present invention, it is possible to provide a server-side storage management recording medium which can reduce the access time of programs and data and can contribute to the reduction of the program execution time on the client side.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a server / client system according to the present invention.

FIG. 2 is a diagram schematically illustrating an execution program on a client side.

FIG. 3 is a view for explaining the storage contents of a structure management table for managing the structure of an execution program on the client side.

FIG. 4 is a hardware configuration diagram on the client side using a storage management recording medium.

FIG. 5 is a hardware configuration diagram of a server using a storage management recording medium.

FIG. 6 is a view for explaining a series of processing operations by a client-side storage management computer.

FIG. 7 is an exemplary view for explaining a series of processing operations performed by a server-side storage management computer;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Client 11 ... Execution program 12 ... Storage medium 13 ... Storage management mechanism 17 ... Storage management computer 18 ... Storage management recording medium 20 ... Server 21 ... Structure management table 22 ... Low speed access storage medium 23 ... High speed accessible storage Medium 24: Storage management mechanism 26: Computer for storage management 27: Recording medium for storage management

Claims (7)

[Claims] 1. When executing an execution program,
In a client that downloads and executes a subprogram and data from a server, a small-capacity storage medium for storing the subprogram and data, and whether the subprogram or data required for executing the execution program exists in the storage medium Storage management means for determining whether or not the server exists, and issuing a download request to the server when the client does not exist. 2. The client according to claim 1, wherein when there is no data including the subprogram in the storage medium, the subprogram and data stored in the storage medium are deleted in a predetermined order, and the data is deleted from the server. A client provided with data discarding means for storing downloaded subprograms and data. 3. A server for downloading subprograms and data based on a request from a client, comprising: a structure management table for storing and managing the structure of an execution program on the client side; and a subprogram required for executing the execution program on the client side. A data storage medium for storing programs and data, and when receiving a download request from the client, download the corresponding subprogram or data and refer to the structure of the execution program in the structure management table, and A server comprising: a storage management unit that determines a program and data and sets the state so as to be able to respond to a next download request. 4. A server which downloads sub-programs and data based on a request from a client, comprising: a structure management table for storing and managing a structure of a client-side execution program; A low-speed storage medium for low-speed access for storing programs and data, a high-speed storage medium for high-speed access, and when receiving a download request from the client, download a corresponding subprogram or data and execute the structure management table. A server comprising: a storage management unit having a read-ahead function of reading a subprogram or data to be downloaded next from a low-speed storage medium based on a program structure and storing the read subprogram or data in a high-speed storage medium. 5. A server / client system for downloading and executing a subprogram and data required for executing an execution program on a client from a server, comprising: a storage medium having a small storage capacity for storing the subprogram and data; A client having first storage management means for determining whether or not the subprogram or data necessary for execution of the execution program exists in the storage medium and issuing a download request to the server when the subprogram or data does not exist; A structure management table for storing and managing the structure of the execution program on the client side, a subprogram required for executing the execution program on the client side, a storage medium for low-speed access for storing data, a storage medium for high-speed access, and the client When a download request is received from A storage management means having a read-ahead function of downloading the corresponding subprogram or data and reading the subprogram or data to be downloaded next from the structure of the execution program in the structure management table from the low-speed storage medium and storing it in the high-speed storage medium. And a server comprising: a server and a client system. 6. A first storage medium storing a first subprogram downloaded from a server in response to a download request in a storage management computer on a client side for executing an execution program. An execution notification function for sending an execution notification to the server as the first subprogram is started and executed, a request object determination function for determining a request object during or after execution of the first subprogram, and a request object When it is a request for the second subprogram or data from the determination result of the determination function, it is checked whether or not the request target exists in the storage medium. If not, the size of the request target is determined from the server. An area checker that obtains a request and checks whether an empty area corresponding to this size exists in the storage medium. Client-side storage in which a program for realizing a sub function and a discard function of deleting data and downloading the requested object in a predetermined order when the storage medium has no free area corresponding to the size is stored in the storage medium. Management recording medium. 7. When a download request for a first subprogram is issued to a storage management computer on a server side that receives a download request from a client and downloads a request target, a subprogram relating to an execution program stored in a storage medium is received. A program download function for downloading a first subprogram in programs and data, and a structure management table for storing a structure of an execution program when a notification of execution of the first subprogram is received from a client. A confirmation function for confirming the presence or absence of lower data or a second subprogram relating to the subprogram of
A transfer function of transferring the lower-order data stored in the storage medium to a high-speed storage medium, and transferring the second subprogram stored in the storage medium to the high-speed storage medium when it is confirmed that a second subprogram is present; And a server-side storage management recording medium that records a program for realizing a high-speed download function of downloading lower-order data or a second subprogram of the high-speed storage medium when receiving a download request from the client.