JP4742888B2 - Server device, client device, and program - Google Patents

Description

  The present invention is configured such that a client device that makes a service request to a server device that operates an application program and a server device that operates an application program based on the service request from the client device can be connected to each other via a network. Server-based computing system.

In recent years, the adoption of server-based computing by companies has been rapidly progressing.
Server-based computing is a system in which a client device and a server device can be connected to each other via a network. When a client device makes a service request to the server device, the server device receives a request from the client device. Data management and application programs are operated based on service requests (see, for example, Patent Document 1 and Non-Patent Document 1).

  The server device creates display data for the client and sends it to the client device. In a client device (also called a thin client device), operation information such as a user's key and mouse is sent to a server device via a network, and display data for a client created on the server device side is received and displayed. . The client device only needs to include an input device such as a network device, a display device, and a mouse and a keyboard. Since no data is stored in the client device, storage such as a hard disk is not required, and application programs are not executed. Therefore, the processing load required for the client device is light.

By introducing server-based computing, companies can manage resources such as data and application programs on the server device side, which has the advantage of reducing operational costs. In addition, the client device has an advantage that it can be procured at a lower cost than a conventional personal computer. Also in terms of security, it is possible to reduce the risk of unauthorized access to information by restricting access to data in the server device and collecting access logs. It is possible to deal with viruses in a batch with the server device.
JP 2005-228227 A http: // www. keyman. or. jp / search / 30000031_1. html (server-based computing)

  As described above, when server-based computing is executed, a client device that makes a service request to the server device that operates the application program, and a server that operates the application program based on the service request from the client device The apparatus is configured to be connectable to each other via a network.

  When the client device is a mobile terminal device, it is a client device that places importance on mobility, so that the display screen cannot be made large. For example, a 4-inch HVGA (640 × 240) is much smaller than a standard desktop personal computer display size of 15 inches, XGA (1024 × 768). Therefore, every time the display data of the client device is changed in response to the operation of the client device, it is necessary to transmit the display data from the server device to the client device. In particular, when the display screen of the client device is small, there is a problem that access to the server device 101 frequently occurs and the power consumption of the mobile terminal device 104 is increased. Furthermore, when the mobile terminal device is battery-driven, it can be used only for the time corresponding to the installed battery capacity. Also, a large battery pack cannot be used to maintain mobility. In other words, performing server-based computing on a mobile terminal device means using a radio unit that occupies most of the power consumption in the mobile terminal device, which greatly limits the usage time of the mobile terminal device. There was a problem.

  Therefore, the present invention has been made in view of the above problems, and in server-based computing, the frequency of communication between the server device and the client device is reduced, and the power consumption of the client device having mobility is achieved. Another object of the present invention is to provide a server-based computing system that can reduce the visibility and improve the visibility of the display screen of the client device.

The present invention employs the following configuration in order to solve the above problems.
That is, according to one aspect of the present invention, the server device of the present invention is configured such that a server device that operates a program based on a service request from a client device and the client device can be connected to each other via a network. In the server-based computing system, display screen data storage means for storing the display screen data of the client device, display screen data transmission means for transmitting the display screen data in response to a request from the client device, and the display screen data An overall layout image generating means for generating an overall layout image by reducing, an operation data receiving means for receiving operation data of screen operation from the client device, and determining that the overall layout image has been changed by the screen operation of the client device If you did before Characterized in that an entire layout image transmitting means for transmitting the entire layout image to the client device.

  In the server device of the present invention, it is preferable that the overall layout image transmission unit transmits the overall layout image to the client device when an image change amount before and after the update of the overall layout image is larger than a predetermined value.

  According to an aspect of the present invention, the client device of the present invention is configured such that a server device that operates a program based on a service request from the client device and the client device can be connected to each other via a network. In the server-based computing system, a frame memory storage means for storing a frame memory for display of the client device, a display screen data receiving means for receiving display screen data from the server device, and an overall layout from the server device An overall layout image receiving means for receiving an image; a determination means for determining whether display data update by a screen update operation is an update of display data within the range of the frame memory; and within the range of the frame memory by the determination means If the display data is updated Display range identification information generating means for generating identification information indicating the range of the display screen on the entire layout image without requesting transfer of display data to the server device, contents of the frame memory and the entire layout image. And display means for displaying.

  In the client device of the present invention, it is preferable that the display screen data receiving unit determines the operation data and receives the display screen data from the server device in the case of an operation outside the range of the frame memory.

  According to one aspect of the present invention, the program of the present invention is configured such that a server device that operates a program based on a service request from a client device and the client device can be connected to each other via a network. In a server-based computing system, a computer of the server device, display screen data transmitting means for transmitting the display screen data in response to a request from the client device, and an overall layout image for generating an overall layout image by reducing the display screen data Generating means, operation data receiving means for receiving operation data of the screen operation from the client device, and determining the screen operation of the client device and transmitting the entire layout image to the client device when the entire layout image is changed Whole ray to Uto is a program for functioning as an image transmission unit.

  According to one aspect of the present invention, the program of the present invention is configured such that a server device that operates a program based on a service request from a client device and the client device can be connected to each other via a network. In a server-based computing system, the client device computer includes a display screen data receiving unit that receives display screen data from the server device, an entire layout image receiving unit that receives an entire layout image from the server device, and a screen update operation. Determining means for determining whether the update of display data by the display is an update of display data within the range of the frame memory, and display data for the server device when the determination means is an update of display data within the range of the frame memory Requesting the transfer of Without a program for causing the display range identification information generating means for generating identification information indicating the range of the display screen on the entire layout image, display means for displaying the content and the overall layout image of the frame memory as.

  According to the present invention, in server-based computing, the frequency of communication between the server device and the client device is reduced, the power consumption of the client device is reduced, and the entire layout is displayed on the display screen of the client device. The visibility of the display screen of the client device can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an outline of a network configuration of server-based computing.

In FIG. 1, a server apparatus 101 has a function of executing an application program, a function of managing data, and the like.
The client terminal device 102 is connected to the server device 101 via the network 109. The wireless access point 103 is also connected to the server apparatus 101 via the network 109. In addition, mobile terminal devices such as the mobile terminal device 104 and the smartphone 105 are connected to the server device 101 via the network 9 by performing wireless communication with the access point 103. In the following description, the client terminal device 102, the mobile terminal device 104, and the smartphone 105 are collectively referred to as a client device.

  The client terminal device 102, the mobile terminal device 104, or the smartphone 105 constructs a server-based computing system with the server device 101.

  The mobile terminal device 104 is connected to the server device 101 via a wireless network (for example, WiFi) and the access point 103. A mobile terminal device such as the mobile terminal device 104 is designed with low power consumption in consideration of battery life.

FIG. 2 is a diagram illustrating an example of a breakdown of power consumption of the mobile terminal device 104.
The mobile terminal device 104 consumes power mainly in the LSI unit, the display unit, and the radio unit as shown in FIG. In the example shown in FIG. 2, the wireless unit is operating 100%. If the non-communication period with the server apparatus 101 can be long, the wireless unit can be powered down. However, in general, communication is frequently performed.

  As shown in FIG. 2, the power consumption of the wireless unit occupies 65% of the power consumed by the mobile terminal device. Since the mobile terminal device 104 is battery-driven, the mobile terminal device 104 can only use time according to the installed battery capacity, and performing server-based computing in the mobile terminal device 104 means that the power consumption in the mobile terminal device 104 is reduced. The radio unit occupies the majority, and this limits the usage time of the mobile terminal device 104.

  In the server-based computing system to which the present invention is applied, the entire layout image obtained by reducing the frame buffer in the server device is transferred to the client terminal device in advance, and if the operation is within the terminal frame buffer, the entire layout image is transferred. Is used to display the entire layout image on the client device side. When the contents of the image are updated, the entire layout image is transferred from the server device. However, if there are few changes in the image, the entire layout image is not transferred and the entire image remaining in the client device. Use layout images.

FIG. 3 is a diagram showing an outline of the configuration of the mobile terminal device 104 to which the present invention is applied.
In FIG. 3, the mobile terminal device 104 includes an LSI 200, an LCD 210, a program storage memory 212, and a work memory 213.

  The LSI 200 is configured by SOC (System On Chip). The internal configuration of the LSI 200 will be described. The CPU 201 controls communication with each unit via an internal bus (Bus) 204a. A memory controller (Mem. Cont.) 204 controls the internal bus 204b, a work memory 213 such as SDRAM, and a program storage memory 212 such as FROM. The LCDC (LCD controller) 202 transfers display data to the LCD 210 (display unit) using the built-in memory 203 such as a RAM built in the LSI 200. Further, it is configured by a UART (Universal Asynchronous Receiver) 206, a power management block (Power Mgmt) 207, a real-time counter (RTC) 205, a USB function (USBF) 208, and the like. The wireless communication unit 209 enables communication by WiFi and is connected to the UART 206.

FIG. 4 is a diagram showing an internal configuration of the LCDC.
In FIG. 4, the LCDC 202 is connected to the internal bus 204 a of the LSI 200 via a bus interface (BUS I / F) 301. The register (Reg.) 302 stores various setting information for the LCDC 202. A memory controller (Memory Cont.) 303 controls a built-in memory (memory for storing display data) 203. The memory controller 303 includes a DMAC (direct memory access controller) 303a. The DMAC 303 a manages data transfer from the built-in memory 203 to the LCD 210.

  Display data read from the internal memory 203 by the DMAC 303a is synchronized by a FIFO (first-in first-out memory) 304, and then processed to a desired enlargement ratio by a resizer 305 having an enlargement / reduction function. .

  Then, synchronization is taken by the FIFO 306. The internal memory 203 also stores an entire reduced image corresponding to the frame buffer of the server apparatus 101 (the operation will be described later). The read out whole reduced image is synchronized by the FIFO 307.

  Further, the current display position in the whole is drawn by the frame drawing device 308 to generate the whole layout image. The α blend synthesizer 309 synthesizes the display image synchronized with the FIFO 306 and the entire layout image. After synchronizing with the FIFO 310, the display data is transferred to the LCD 210 (display unit) via the LCD I / F 311 to display an image. The display unit of the mobile terminal device 104 has a display area of HVGA (640 × 240), while the frame buffer 500 in the built-in memory of the mobile terminal device 104 has a region 501 of VGA (640 × 480) (see FIG. 9). ). Then, display data equivalent to HVGA (640 × 240) is read from the area of the frame buffer and displayed on the display unit. The display area of the display section and the area of the frame buffer are not limited to the above example, and any area may be used as long as the area of the frame buffer is set larger than the display area of the display section. As described above, the internal memory 203 also stores the overall reduced image. The area currently displayed on the display unit in the overall reduced image is drawn by the frame drawing device 308, and is used as the overall layout image. Generated, synthesized and displayed on a part of the display unit.

FIG. 5 is a diagram showing an outline of the configuration of the server device.
In FIG. 5, the server device 101 includes a CPU (Central Processing Unit) 701, a program for executing processing executed in the server device 101, and a control program for controlling and executing each function of the server device 101. A memory 702 such as a ROM or a RAM in which an image is stored, an input unit 703 for inputting various data and signals, a display unit 704 for displaying images and other information, and recording various information including images. A storage unit 705 for driving, a recording medium driving unit 706 for driving an external recording medium, and a network connection unit 707 for connecting to a network 109 such as a LAN are connected to the bus 700, and the CPU 701 controls each of these units. ing.

  FIG. 6 is a diagram illustrating the frame buffer and the entire reduced image on the server device side. The server apparatus 101 executes an application program with a display size of XGA (1024 × 768), and handles a frame buffer 400 equivalent to XGA.

  6A shows the frame buffer 400 of the server apparatus 101 and the VGA size area 401 that has been transmitted to the mobile terminal apparatus 104, and the upper left coordinates of the area 401 that has been transmitted to the mobile terminal apparatus 104 and the coordinates thereof. Although the width and height are not shown, they are managed and stored for each client on the server device side, and transferred to the mobile terminal device 104 at a desired timing. FIG. 6B shows an overall reduced image 402 obtained by reducing the frame buffer 400 on the server apparatus 101 side to 1 / n. The overall reduced image 402 and its reduction rate are managed and stored for each client on the server apparatus side. As will be described later, it is transferred to the mobile terminal device 104 at a desired timing.

Next, the operation in the mobile terminal device 104 constituting the server-based computing system described above will be described.
FIG. 7 is a flowchart showing a flow of screen update processing of the mobile terminal device 104.

  When an operation of a keyboard or pointing device provided in an input unit (not shown) of the mobile terminal device 104 is performed, this is detected in step 600, and in step 601, the operation is performed on the display unit of the mobile terminal device 104. It is determined whether the operation is to scroll the display data displayed on the LCD 210. If the operation is a scroll operation (step 601: Y), the processing after step 700 in FIG. On the other hand, if the operation is other than scrolling (step S601: N), the processing after step 801 in FIG.

  Steps 700 to 709 in FIG. 8 are flowcharts showing the flow of scroll processing of the mobile terminal device 104, and steps 710 to 713 in FIG. 8 are processing of the server device 101 in response to the scroll processing of the mobile terminal device 104. It is a flowchart to show.

FIG. 9 is a diagram illustrating a state (part 1) of the frame buffer and the display unit on the mobile terminal device 104 side.
As described above, the frame buffer 500 (FIG. 9A) of the mobile terminal device 104 has a VGA area, and data is transferred from the server device 101 and already held as valid data. The frame buffer 500 is generated on the built-in memory 203. Further, the built-in memory 203 has a memory area for storing the entire reduced image 502, and stores the entire reduced image 502 sent from the server apparatus 101. (Figure 9 (C))
First, in step 700, when the CPU in the mobile terminal device 104 detects a scroll operation, in step 701, the CPU 201 determines whether the display range by scrolling is a movement in the frame buffer (FB) 500.

  That is, the display unit of the mobile terminal device 104 is a display area of HVGA (640 × 240), but the frame buffer 500 has an area 501 of VGA (640 × 480), so the range of display data to be newly displayed by scrolling is a frame. Whether or not the display area is within the display area stored in the buffer 500 is determined from the reading position when the display data is read out from the frame buffer area. In the area read and displayed on the display unit, the upper left coordinates, height, and width are stored and managed in the built-in memory on the frame buffer 500.

  If it is determined in step 701 that the range of display data to be newly displayed by scrolling is outside the range of the display area stored in the frame buffer 500 (step 701: out of range), the contents of the frame buffer 500 are determined in step 702. The server apparatus 101 is requested to rewrite data. In this data request, a scroll event is sent to the server apparatus 101.

  Upon receiving this event, the server apparatus 101 side selects and compresses data to be transferred into the frame buffer 400 at step 710 at step 710. In step 712, the compressed data is transferred to the mobile terminal device 104.

In step 703, the mobile terminal device 104 receives display data, and in step 704, updates the frame buffer 500 while decompressing.
On the other hand, if the determination in step 701 is within the range (step 701: within range), the process proceeds to step 705 without making any data request to the server apparatus 101.

  Then, the CPU 201 sets an area 501 to be displayed on the LCD 210 in the frame buffer 500 in the LCDC 202. FIG. 9B shows a display data area 501 (shaded portion) displayed on the display unit 210 among the data in the frame buffer 500. The memory controller 303 acquires the display data area 501 from the frame buffer 500 in the built-in memory 203. Since the scrolling operation is performed here, the enlargement ratio to the resizer 305 is set to 1 (no enlargement / reduction process is performed), and is displayed on the LCD display image 504 in step 705.

  Further, in step 706, the entire reduced image 502 is read from the built-in memory 203, based on the upper left coordinates indicating the display area (frame buffer) of the client received from the server, its width and height, and the reduction ratio of the entire reduced image. Thus, an area corresponding to the frame buffer on the entire reduced image is obtained, and the area read out and displayed on the display unit is stored and managed in the built-in memory in the frame buffer 500 in the upper left coordinates, height, and width. The frame corresponding to the frame buffer on the entire reduced image is corrected to the currently displayed area, and a frame 503 indicating the currently displayed area is drawn on the entire reduced image 402 by the frame drawing unit 308. A layout 502 is generated. FIG. 9D shows the generated overall layout 502. In addition, although the example displayed with the frame was demonstrated, the area | region currently displayed may be identified with a color and you may carry out by another area identification. A frame 503 indicates an area displayed on the LCD 210 in the entire area (synonymous with the frame buffer 400 of the server apparatus 101).

  In step 708, the α blend generator 309 synthesizes the LCD display image 504 and the entire layout 502 and displays the image on the LCD 210. The α blend generator 309 can set what percentage of the entire layout 502 is superimposed on the LCD display image 504. If it is 100%, the entire layout 502 is formed on the LCD display image 504 so as to be overwritten. FIG. 9D shows a display state on the LCD 210.

  If the α blend generator 309 is specified as 50%, the user can also recognize the LCD display image 504 formed under the overall layout 502 by setting 50%, and the display area can be changed. It can be used effectively.

FIG. 10 is a diagram illustrating a state (part 2) of the frame buffer and the display unit on the mobile terminal device 104 side.
The example shown in FIG. 10 shows a state when a downward scroll occurs from the state shown in FIG. FIG. 10A shows the frame buffer 500, and the display area is moved to 602 by scrolling. This is an operation in the frame buffer 500, and no communication has occurred with the server apparatus 101. As described with reference to FIG. 8, the LCD display image 603 is generated. Note that FIG. 9A corresponds to FIG. 10A, and FIG. 9D corresponds to FIG. 10B.

  FIG. 11 is a flowchart showing a flow of screen rewriting processing of the mobile terminal device 104. Steps 800 to 809 are flowcharts showing processing of the mobile terminal device 104. Steps 810 to 819 are steps in the mobile terminal device 104. It is a flowchart which shows the process of the server apparatus 101 which responds.

  If it is determined in step 601 of FIG. 7 that the operation is other than scrolling (step S601: N), a signal indicating the content of the operation is transferred to the server apparatus 101 in step 801. Here, for example, it is assumed that a radio button is clicked with a mouse. This corresponds to sending the information that the mouse is clicked and the clicked coordinates to the server apparatus 101.

  When the server apparatus 101 receives the signal in step 810, the server apparatus 101 that has received the operation performs processing according to the operation in step 830. In the present embodiment, a desired radio button is selected. In step 811, the frame buffer 400 is updated. Further, in step 812, the updated contents of the frame buffer 400 are compressed, and in step 813, the contents are transferred to the mobile terminal device 104.

  Subsequently, in step 831, since the frame buffer 400 of the server apparatus 101 has been updated, an entire reduced image is generated. Then, in step 814, the generated overall reduced image is compared with the overall reduced image that has been transferred to the mobile terminal device 104 side. With a small change, the change in the reduced image cannot be recognized. In this determination, the entire reduced image after the update of the frame buffer 400 is compared with the entire reduced image before the update. As a determination method, for example, the determination may be made by taking the sum of the color distances of all corresponding dots. Alternatively, the identity may be determined by comparing two reduced images. When a radio button is selected, the change cannot be recognized in the reduced image, and therefore the entire reduced image is not transferred (step 814: None). On the other hand, as a result of the comparison in step 814, if it is determined that transfer of the entire reduced image is necessary, that is, if there is a change (step 814: present), in step 815, the mobile terminal device 104 is directed to. Transfer data.

  In step 802, the mobile terminal device 104 receives data, and in step 803 updates the frame buffer 500. When the entire reduced image is sent, the entire reduced image is also updated. Steps 804 to 806 are the same as steps 705, 706, and 708 described with reference to FIG.

  In the above-described embodiment, the determination of the entire reduced image update is performed on the server apparatus 101 side. However, the mobile terminal apparatus 104 compares and determines before and after the frame buffer 500 is updated, and if necessary, the mobile terminal apparatus The entire reduced image may be requested to the server apparatus 101 on the 104 side.

  As described above, the embodiments of the present invention have been described. As a result, in server computing using a client device with a narrow display screen, the communication frequency can be reduced and the power consumption can be reduced. Further, by performing the overall layout display with low power consumption, comfortable operation can be performed even on a narrow screen.

  The embodiment of the present invention described above can be realized by firmware or software on a hardware, a DSP (Digital Signal Processor) board or a CPU board as one function of the server apparatus or the client apparatus.

  The embodiments of the present invention have been described above with reference to the drawings. However, the server device or the client device to which the present invention is applied is limited to the above-described embodiments as long as the function is executed. Needless to say, a single device, a system composed of a plurality of devices, an integrated device, or a system that performs processing via a network such as a LAN or WAN may be used. .

  It can also be realized by a system including a CPU, a ROM or RAM memory connected to a bus, an input device, an output device, an external recording device, a medium driving device, and a network connection device. That is, a ROM or RAM memory, an external recording device, or a portable recording medium in which a software program for realizing the system of the above-described embodiment is recorded is supplied to the server device or client device, and the server device or client is supplied. Needless to say, this can also be achieved by the computer of the apparatus reading and executing the program.

  In this case, the program itself read from the portable recording medium or the like realizes the novel function of the present invention, and the portable recording medium or the like on which the program is recorded constitutes the present invention.

  Examples of portable recording media for supplying the program include flexible disks, hard disks, optical disks, magneto-optical disks, CD-ROMs, CD-Rs, DVD-ROMs, DVD-RAMs, magnetic tapes, and nonvolatile memory cards. Various recording media recorded via a network connection device (in other words, a communication line) such as a ROM card, electronic mail or personal computer communication can be used.

  The computer (information processing apparatus) executes the program read out on the memory, thereby realizing the functions of the above-described embodiment, and an OS running on the computer based on the instructions of the program. Performs part or all of the actual processing, and the functions of the above-described embodiments are also realized by the processing.

  Furthermore, a program read from a portable recording medium or a program (data) provided by a program (data) provider is stored in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. After being written, the CPU of the function expansion board or function expansion unit performs part or all of the actual processing based on the instructions of the program, and the functions of the above-described embodiments are also realized by the processing. obtain.

  That is, the present invention is not limited to the embodiment described above, and can take various configurations or shapes without departing from the gist of the present invention.

It is a figure which shows the outline of the network structure of server-based computing. It is a figure which shows an example of the breakdown of the power consumption of a mobile terminal device. It is a figure which shows the outline of a structure of the mobile terminal device to which this invention is applied. It is a figure which shows the internal structure of LCDC. It is a figure which shows the outline of a structure of a server apparatus. It is a figure which shows the frame buffer and whole reduced image by the server apparatus side. FIG. 4A is a diagram showing a frame buffer on the server device side, and FIG. 4B is a diagram showing an entire reduced image on the server device side. It is a flowchart which shows the flow of the screen update process of a mobile terminal device. It is a flowchart which shows the flow of the scroll process of a mobile terminal device. It is a figure showing the state (the 1) of the frame buffer and display part by the side of a mobile terminal device. FIG. 4A is a diagram showing a frame buffer of the mobile terminal device, and FIG. 4B is a diagram showing a display data area displayed on the display unit among data in the frame buffer of the mobile terminal device. FIG. 4C is a diagram showing an entire reduced image of the mobile terminal device, and FIG. 4D is a diagram showing an entire layout of the mobile terminal device. It is the figure showing the state (the 2) of the frame buffer and the display part by the side of a mobile terminal device. FIG. 2A is a diagram showing a frame buffer of the mobile terminal device, and FIG. 2B is a diagram showing an overall layout of the mobile terminal device. It is a flowchart which shows the flow of the screen rewriting process of a mobile terminal device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Server apparatus 102 Client terminal apparatus 103 Wireless access point 104 Mobile terminal apparatus 105 Smartphone 109 Network 200 LSI
201 CPU
202 LCD controller (LCDC)
203 Internal memory (RAM)
204 Memory Controller (Mem. Cont.)
204a Internal bus (Bus)
204b Internal bus 205 Real-time counter (RTC)
206 Asynchronous serial communication (UART)
207 Power Management Block (Power Mgmt)
208 USB function (USBF)
209 Wireless communication unit (WiFi)
210 LCD
212 Program storage memory (FROM)
213 Work memory (SDRAM)
301 Bus interface (BUS I / F)
302 Register (Reg.)
303 Memory Controller (Memory Cont.)
303a DMAC (Direct Memory Access Controller)
304 FIFO (first-in first-out memory)
305 Resizer
306 FIFO
307 FIFO
308 Frame drawing device 309 α blend synthesizer 310 FIFO
311 LCD I / F
400 frame buffer (server side)
401 VGA size area 402 Whole reduced image 500 Frame buffer (mobile terminal side)
501 Display area 502 Overall layout 503 Frame 504 LCD display image 602 Display area 603 LCD display image 701 CPU
702 Memory 703 Input unit 704 Display unit 705 Storage unit 706 Recording medium drive unit 707 Network connection unit 700 Bus

Claims (6)

In a server-based computing system configured such that a server device that operates a program based on a service request from a client device and the client device can be connected to each other via a network,
Display screen data storage means for storing display screen data of the client device;
Display screen data transmitting means for transmitting the display screen data at the request of the client device;
Whole layout image generating means for reducing the display screen data and generating a whole layout image;
Operation data receiving means for receiving operation data of screen operation from the client device;
An overall layout image transmitting means for transmitting the entire layout image to the client device when it is determined that the entire layout image has been changed by a screen operation of the client device;
A server device comprising: The overall layout image transmitting means transmits the overall layout image to a client device when an image change amount before and after the update of the overall layout image is greater than a predetermined value.
The server device according to claim 1, wherein: In a server-based computing system configured such that a server device that operates a program based on a service request from a client device and the client device can be connected to each other via a network,
Frame memory storage means for storing a frame memory for display of the client device;
Display screen data receiving means for receiving display screen data from the server device;
Whole layout image receiving means for receiving a whole layout image from the server device;
A discriminating means for discriminating whether the update of the display data by the operation of the screen update is an update of the display data within the range of the frame memory;
A display for generating identification information indicating the range of the display screen in the entire layout image without requesting transfer of the display data to the server device when updating of the display data within the range of the frame memory by the determining means Range identification information generating means;
Display means for displaying the contents of the frame memory and the entire layout image;
A client device comprising: The display screen data receiving means determines the operation data, and receives display screen data from the server device in the case of an operation outside the range of the frame memory.
4. The client apparatus according to claim 3, wherein In a server-based computing system configured such that a server device that operates a program based on a service request from a client device and the client device can be connected to each other via a network,
A computer of the server device;
Display screen data transmitting means for transmitting the display screen data at the request of the client device;
Whole layout image generating means for reducing the display screen data to generate a whole layout image;
Operation data receiving means for receiving operation data of screen operation from the client device;
An overall layout image transmitting means for transmitting the entire layout image to the client device when the screen operation of the client device is determined and the entire layout image is changed;
Program to function as. In a server-based computing system configured such that a server device that operates a program based on a service request from a client device and the client device can be connected to each other via a network,
A computer of the client device;
Display screen data receiving means for receiving display screen data from the server device;
An overall layout image receiving means for receiving an overall layout image from the server device;
A discriminating means for discriminating whether updating of display data by an operation of screen updating is updating of display data within the range of the frame memory;
A display for generating identification information indicating the range of the display screen in the entire layout image without requesting transfer of the display data to the server device when updating of the display data within the range of the frame memory by the determining means Range identification information generating means,
Display means for displaying the contents of the frame memory and the entire layout image;
Program to function as.