JP2011018290A - Screen sharing system and data transfer method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transfer data between memory spaces of separate information processing apparatuses by user's operation on a sharing area of a screen sharing system.SOLUTION: The screen sharing system includes on a client's screen, a sharing area for displaying partial screen information of a server and makes the server reproduce input event information generated in the sharing area to remotely control the server from the client. In the system, the client detects a data transfer instruction to the sharing area, requests the server to transfer data, receives the data transferred from the server, and develops the received data in a client's memory space. When receiving the data transfer request from the client, the server determines which is transferred, UI data for displaying an operating state or real data for ending the operation. Then, the server converts data to be transferred present in the memory space of the server to a transferable state and transmits the converted data to the client.

Description

  The present invention relates to a screen sharing system and a data transfer method for sharing a screen among a plurality of information processing apparatuses.

In recent years, screen sharing systems that share a screen among a plurality of information processing apparatuses have been used in various scenes. This screen sharing system is used in the following cases.
-When remotely operating an information processing device in a remote location-When displaying the screen of an information processing device such as a laptop computer brought into the conference room on a large display installed in the conference room via a network In addition to screen sharing among a plurality of information processing devices, there is also a method in which a user operates a shared screen of a client information processing device to transfer a file between memory spaces of different information processing devices (for example, , See Patent Document 1).

JP 2006-172193 A

  However, the above-described screen sharing system has a problem that data transfer occurs every time an operation across the shared screen is performed.

  Due to this problem, when a user performs an operation of transferring an image or video having a large data size, the user feels that the operation has become sluggish.

  It is an object of the present invention to improve a user's operational feeling with respect to a shared screen operation by separating the transfer of UI data used for operation by the screen sharing system and the transfer of actual data.

According to the present invention, a client device and a server device are connected via a network, the server device transfers at least part of screen information to the client device, and the client device transfers the transferred screen information to a shared area on the screen. And the event information generated for the shared area is transferred to the server device, and the server device reproduces the transferred input event information, thereby enabling remote operation of the server device from the client device. A screen sharing system to perform,
The client device is
Detecting means for detecting an instruction of data transfer from the shared area;
Request means for requesting data transfer to the server device;
Receiving means for receiving data transferred from the server device;
Expanding means for expanding the data received by the receiving means into the memory space of the client device;
The server device
When receiving a data transfer request from the client device, determination means for determining which of UI data for displaying a status during operation or actual data for ending the operation;
Conversion means for converting the data to be transferred in the memory space of the server device into a transferable state;
Transmission means for transmitting the data converted by the conversion means to the client device.

  According to the present invention, it is possible to improve the user's operational feeling with respect to the shared screen operation by separating the transfer of UI data used for operation by the screen sharing system and the transfer of actual data.

It is a figure which shows the network structure of the screen sharing system by this embodiment. It is the schematic which shows the hardware constitutions of the client information processing apparatus and server information processing apparatus which comprise the screen sharing system by this embodiment. It is the schematic which shows the function structure of the information processing apparatus by this embodiment. 3 is a flowchart showing data transfer processing in a client information processing apparatus 101. It is a figure which shows the example of a display of the client information processing apparatus 101 screen-shared by the screen sharing function. It is a figure which shows the operation screen management table which the screen sharing application program 222 manages. 3 is a flowchart showing data transfer processing in server information processing apparatuses 102 and 103; It is a flowchart which shows the detail of the transfer data conversion process in FIG.7 S704 and step S707. 3 is a diagram illustrating a screen display example of a client information processing apparatus 101 and server information processing apparatuses 102 and 103. FIG. It is a figure which shows an example which implement | achieves a hierarchical screen sharing system.

  The best mode for carrying out the invention will be described below in detail with reference to the drawings.

  FIG. 1 is a diagram showing a network configuration of the screen sharing system according to the present embodiment. As shown in FIG. 1, the screen sharing system is a system in which a client information processing apparatus 101, a server information processing apparatus 102, and a server information processing apparatus 103 are connected to a network 111, each having a communication function.

  FIG. 2 is a schematic diagram illustrating a hardware configuration of the client information processing apparatus and the server information processing apparatus that configure the screen sharing system according to the present embodiment. Note that both the client information processing apparatus and the server information processing apparatus are realized by a computer system such as a personal computer, and therefore will be described as the information processing apparatus 201 in FIG.

  The information processing apparatus 201 includes a CPU 211 that controls the entire apparatus, a ROM 212 that stores a boot program and fixed data, and a RAM 213 that functions as a main memory and provides a work area for the CPU 211. Furthermore, the information processing apparatus 201 has the following configuration.

  An HDD 214 is a hard disk device, and stores an operating system (OS) 221, a screen sharing application program 222, a document editing application program 223, and the like. A VRAM 215 is a memory for developing image data to be displayed, and displays the image data on the display 231 which is an example of a display device by expanding the image data.

  The keyboard 232, mouse 233, and digitizer 234 as input devices are connected to the keyboard controller 216, mouse controller 217, and digitizer controller 218, respectively, and the input is detected as an interrupt signal by the CPU 211. A network interface (I / F) 219 is also provided and can be connected to the network 111.

  In the above configuration, the screen sharing application program 222 and the document editing application program 223 are activated in response to specific instruction events from the keyboard 232, mouse 233, and digitizer 234. At the time of activation, the screen sharing application program 222 and the document editing application program 223 are first loaded into the RAM 213 and executed by the CPU 211.

  The screen sharing application program 222 described above may be linked depending on the OS 221. The screen sharing application program 222 realizes a screen sharing function described later.

  FIG. 3 is a schematic diagram illustrating a functional configuration of the information processing apparatus according to the present embodiment. In FIG. 3, reference numeral 301 corresponds to the information processing apparatus 201 shown in FIG. Reference numeral 302 denotes a display device corresponding to the display 231 shown in FIG. Reference numeral 303 denotes an input device corresponding to the keyboard 232, mouse 233, and digitizer 234 shown in FIG.

  The information processing apparatus 301 includes a communication unit 311, a data control unit 312, a data storage unit 313, an output unit 314, and an input unit 315. The communication unit 311 is connected to the network 111 and performs information communication control processing for exchanging data with other information processing apparatuses. The data control unit 312 controls processing such as screen sharing and data transfer. The data storage unit 313 stores data exchanged through screen sharing or data transfer.

  The output unit 314 outputs display screen information to a liquid crystal display, a rear projection display, or the like. The input unit 315 inputs information detected by the input device 303 and transmits the information to the data control unit 312.

  Next, data transfer in the screen sharing system according to the present embodiment will be described with reference to FIGS. First, data transfer in the client information processing apparatus 101 will be described with reference to FIG. An example of data transfer by a drag operation (drag and drop) on the shared screen and the local screen of the client information processing apparatus 101 will be described.

  Here, the local screen is a screen displaying the local environment without using the screen sharing function. In addition to the drag operation, it goes without saying that a case where data transfer is performed by a copy instruction & paste instruction or transfer instruction by a clipboard on the shared screen is also included. The copy instruction & paste instruction and the transfer instruction for the shared screen are as follows.

  For example, when an object included in a file or application is selected and instructed using a displayed menu, or an object included in the file or application is instructed by double-clicking.

  FIG. 4 is a flowchart showing data transfer processing in the client information processing apparatus 101. First, a screen sharing function is started between the server information processing apparatuses 102 and 103 and the client information processing apparatus 101, and the client information processing apparatus 101 shares a screen with the server information processing apparatuses 102 and 103. A display example of the client information processing apparatus 101 at this time is shown in FIG.

  In FIG. 5, reference numeral 501 is a display screen example of the client information processing apparatus 101, 502 is a display screen example of the server information processing apparatus 102, and 503 is a display screen example of the server information processing apparatus 103. Here, a display screen example 501 of the client information processing apparatus 101 will be described. Reference numeral 511 denotes a display example of the document editing application program 223 activated by the client information processing apparatus 101.

  Reference numeral 512 denotes a display example of the screen sharing application program 222 activated on the client information processing apparatus 101 (the display screen 502 of the server information processing apparatus 102 is displayed on the client information processing apparatus 101 by the screen sharing function).

  Reference numeral 513 denotes a display example of the screen sharing application program 222 activated on the client information processing apparatus 101 (the display screen 503 of the server information processing apparatus 103 is displayed on the client information processing apparatus 101 by the screen sharing function).

  Next, the data control unit 312 of the client information processing apparatus 101 acquires coordinate information input via the input unit 315 from the input device 303 such as the mouse 233 or the digitizer 234 in step S 401, and stores it in the data storage unit 313. Remember. Next, in step S402, the data control unit 312 of the client information processing apparatus 101 determines the information processing apparatus An to be operated based on the coordinate information stored in the data storage unit 313. An represents the current operation target device.

  FIG. 6 is a diagram showing an operation screen management table managed by the screen sharing application program 222. This operation screen management table is stored in the data storage unit 313.

  In step S402, an information processing apparatus to be operated is determined from the operation screen management table based on the coordinate information stored in the data storage unit 313 in step S401. At this time, the data control unit 312 of the client information processing apparatus 101 determines that the operation target is the client information processing apparatus 101 for an area that is not included in the operation screen management table.

  Next, in step S403, the data control unit 312 of the client information processing apparatus 101 determines whether or not the operation target information processing apparatus An determined in step S402 is the same as the information processing apparatus Ap of the operation target apparatus flag. To do. Ap represents an operation target device flag, which is set in step S406 to be described later and stored in the data storage unit 313.

  If the result of determination in step S403 is the same, the process proceeds to step S407, and if different, the process proceeds to step S404. In step S404, the data control unit 312 of the client information processing apparatus 101 requests transfer data from the information processing apparatus set in the information processing apparatus Ap of the operation target apparatus flag stored in the data storage unit 313.

  Here, the transfer data is UI data indicating a state in operation and actual data indicating literally “data to be transferred”. The UI data includes the type, size, position, and the like of actual data provided after the operation. The actual data includes file data, image data, moving image data, text data, object data, etc. included in an arbitrary application program. Since the actual data is large in size and takes a long time to transfer, it is used to transfer the UI data smaller than the actual data to indicate the operating state.

  The information processing apparatus Ap provides UI data or actual data to the client information processing apparatus 101 as transfer data in accordance with an algorithm shown in FIG.

  If the information processing device Ap of the operation target device flag is local in step S404 described above, the data control unit 312 of the client information processing device 101 acquires transfer data stored in the data storage unit 313.

  In step S405, the data control unit 312 of the client information processing apparatus 101 transmits the transfer data to the operation target information processing apparatus An. If the information processing device An to be operated is local in step S405, the data control unit 312 of the client information processing device 101 expands the data acquired in step S404 and stores it in the data storage unit 313 as transfer data. Remember.

  Through steps S404 and S405 described above, the transfer data is transferred from the memory space of the information processing device An to the memory space of the information processing device Ap of the operation target device flag.

  Next, in step S <b> 406, the data control unit 312 of the client information processing device 101 sets the operation target information processing device An to the information processing device Ap of the operation target device flag, and stores it in the data storage unit 313.

  Next, in step S407, the data control unit 312 of the client information processing apparatus 101 indicates that the operation target information processing apparatus An stored in the data storage unit 313 is local (in this case, the client information processing apparatus 101). It is determined whether or not. If the operation target information processing apparatus An is local, the process proceeds to step S409. If the operation target information processing apparatus An is not local, the process proceeds to step S408.

  In step S408, the data control unit 312 of the client information processing apparatus 101 transmits the input information stored in the data storage unit 313 in step S401 to the operation target information processing apparatus An, and the process returns to step S401.

  On the other hand, in step S409, the data control unit 312 of the client information processing apparatus 101 continues the local operation. Next, in step S410, the data control unit 312 of the client information processing apparatus 101 determines whether or not the user ends the operation. Here, when the operation is finished, this process is finished. If the operation is not terminated, the process returns to step S401.

  If the user performs a drop operation or a paste operation after requesting and transmitting the transfer data in steps S404 and S405, the transfer data is transferred to the application or file system to be operated. That is, when the user performs a drop operation or a paste operation on the display screen of the screen sharing application program 222, the transfer data is passed to any application or file system running on the server information processing apparatus. Here, the display screen is obtained by displaying the display screen of the server information processing apparatus on the client information processing apparatus using the screen sharing function.

With the processing described above, data transfer of “A”, “B”, and “C” shown in FIG. 5 is realized. Here, “A”, “B”, and “C” are data transfer as follows.
“A”: Data transfer from the memory space of the client information processing apparatus 101 to the memory space of the server information processing apparatus 103 “B”: Data transfer from the memory space of the server information processing apparatus 103 to the memory space of the client information processing apparatus 101 “C”: Data transfer from the memory space of the server information processing apparatus 103 to the memory space of the server information processing apparatus 102 In this embodiment, the data transfer of “B” is described as a specific example. Information processing device An and the information processing device Ap of the operation target device flag can be read as information processing devices corresponding to “A” and “C”.

  Next, data transfer in the server information processing apparatuses 102 and 103 will be described with reference to FIGS.

    FIG. 7 is a flowchart showing data transfer processing in the server information processing apparatuses 102 and 103. First, in step S <b> 701, the data control unit 312 of the server information processing apparatuses 102 and 103 receives the data transmitted from the client information processing apparatus 101 and stores it in the data storage unit 313. This data reception processing is processing corresponding to the data transmission to the server information processing apparatuses 102 and 103 performed by the client information processing apparatus 101 in steps S404, S405, and S408 shown in FIG.

  In step S702, the data control unit 312 of the server information processing apparatuses 102 and 103 analyzes the data received in step S701 and determines whether transfer data is requested. As a result of the determination, if transfer data is requested, the process proceeds to step S703. If transfer data is not requested, the process proceeds to step S710.

In step S703, it is determined whether the operation state is dragging. If the result of determination is that dragging is in progress, processing proceeds to step S704. If not, processing proceeds to step S06. In step S704, the data control unit 312 of the server information processing apparatuses 102 and 103 converts the UI data acquired in the transfer data acquisition process into a transferable state. This processing will be described later with reference to FIG. 8. Next, in step S705, the data control unit 312 of the server information processing apparatuses 102 and 103 transmits the UI data converted in step S704 to the requested transfer destination. The process returns to step S701. In step S706, it is determined whether or not the operation target device flag Ap is local. As a result of the determination, if the operation target device flag Ap is local, a transfer data acquisition process is performed in step S707 to convert the actual data into a transferable state. In step S708, the actual data is transmitted to the requested transfer destination, and the process returns to step S701.

  If the operation target device flag Ap is not local, in step S709, the operation target device is requested to transfer data to transmit the actual data to the requested transfer destination, and the process returns to step S701. By this step S709, the actual data is transferred from the remotely operated terminal to the operation terminal through the shortest path.

  On the other hand, in step S710, the data control unit 312 of the server information processing apparatuses 102 and 103 determines whether the data stored in the data storage unit 313 in step S701 is UI data. As a result of the determination, if the data is UI data, the process proceeds to step S711, and if the data is not UI data, the process proceeds to step S712.

  In step S711, the data control unit 312 of the server information processing apparatuses 102 and 103 expands the data stored in the data storage unit 313 in step S701, stores the data as UI data in the data storage unit 313, and returns to step S701. In step S712, the data control unit 312 of the server information processing apparatuses 102 and 103 determines whether the data stored in the data storage unit 313 in step S701 is actual data. As a result of the determination, if the data is actual data, the process proceeds to step S713. If the data is not actual data, the process proceeds to step S714.

  In step S713, the data control unit 312 of the server information processing apparatuses 102 and 103 expands the data stored in the data storage unit 313 in step S701, stores the data as actual data in the data storage unit 313, and returns to step S701.

  On the other hand, in step S714, the data control unit 312 of the server information processing apparatuses 102 and 103 uses the data stored in the data storage unit 313 in step S701 and performs operations in the local (server information processing apparatus) as steps S402 to S409. Perform the process in. For example, in step S701, the local mouse cursor is moved based on the data stored in the data storage unit 313.

  Next, in step S715, the data control unit 312 of the server information processing apparatuses 102 and 103 determines whether the user ends the operation. If the operation is to be ended, the process is ended. If the operation is not to be ended, the process returns to step S701.

Needless to say, the network configuration of the screen sharing system according to the present invention is not limited to the configuration described above, but may be the following configuration.
・ Server information processing device: multiple units, client information processing device: 1 unit ・ Server information processing device: 1 unit, client information processing device: 1 unit ・ Server information processing unit: 1 unit, client information processing device: multiple units ・ Server Information processing apparatus: plural units, client information processing apparatus: plural units Next, transfer data acquisition processing in step S704 and step S707 shown in FIG. 7 will be described with reference to FIG. Here, as illustrated by “C” in FIG. 9, data transfer from the server information processing apparatus 103 to the server information processing apparatus 102 will be described as an example.

  FIG. 8 is a flowchart showing details of the transfer data conversion processing in steps S704 and S707 in FIG. FIG. 9 is a diagram illustrating a screen display example of the client information processing apparatus 101 and the server information processing apparatuses 102 and 103. 9 are the same as those in FIG.

  In FIG. 9, reference numeral 901 denotes a cursor of the mouse 233 of the client information processing apparatus 101. Here, the information processing apparatus set in the operation target apparatus flag Ap is the server information processing apparatus 103, and the operation target information processing apparatus An determined by the data control unit 312 of the client information processing apparatus 101 is the server information processing apparatus 102. is there. A cursor 902 of the mouse 233 of the server information processing apparatus 103 is present at the position shown in FIG.

  First, in step S801, the data control unit 312 of the server information processing apparatus 103 generates a window 911 under the cursor 902 shown in FIG. Next, in step S802, the data control unit 312 of the server information processing apparatus 103 generates a mouse event. Next, in step S803, the data control unit 312 of the server information processing apparatus 103 processes the mouse event generated in step S802 in the window 911. Through this processing, transfer data stored in the data storage unit 313 of the server information processing apparatus 103 is acquired. In step S804, the data control unit 312 of the server information processing apparatus 103 converts the transfer data acquired in step S803 into a transferable state, and ends this process.

  Whether the data acquired as the transfer data is UI data or actual data is determined in step S703. In step S704, after acquiring the actual data, UI data is created based on the information of the actual data and used as transfer data. On the other hand, in step S707, actual data is used as transfer data.

  5 and 9 are examples in which the client information processing apparatus 101 and the server information processing apparatus 102 are different apparatuses. As shown in FIGS. 2 and 3, there is no difference in the configuration of the client information processing apparatus 101 and the server information processing apparatus 102.

  Therefore, a hierarchical screen sharing system is realized by providing both the data transfer process in the client information processing apparatus 101 shown in FIG. 4 and the data transfer process in the server information processing apparatus 102 shown in FIG. be able to.

  Here, an example of realizing a hierarchical screen sharing system is shown in FIG. In FIG. 10, reference numeral 1001 functions as the server information processing apparatus 102 for the client information processing apparatus 101 and also functions as the client information processing apparatus 101 for the server information processing apparatus 102.

  In this way, at least part of the screen information of the server is transferred to the client via the network, and the transferred screen information is displayed as a shared area on the client screen. Then, the input event information generated in the shared area by the client is transferred to the server, and the transferred input event information is reproduced as the input event information of the server.

  Therefore, in a screen sharing system in which a server remotely operates from a client, data can be transferred between memory spaces of different information processing apparatuses when a user operates the shared screen on the client information processing apparatus.

  In the present embodiment, image data, moving image data, text data, and object data included in a file or an arbitrary application are taken up as data transferred between memory spaces of different information processing apparatuses. However, it goes without saying that the present invention can also handle other data.

[Other Embodiments]
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

Claims (15)

A client device and a server device are connected via a network, the server device transfers at least part of screen information to the client device, and the client device displays the transferred screen information as a shared area on the screen, A screen sharing system for performing remote operation of the server device from the client device by transferring the input event information generated for the shared area to the server device and reproducing the transferred input event information. Because
The client device is
Detecting means for detecting an instruction of data transfer from the shared area;
Request means for requesting data transfer to the server device;
Receiving means for receiving data transferred from the server device;
Expanding means for expanding the data received by the receiving means into the memory space of the client device;
The server device
When receiving a data transfer request from the client device, determination means for determining which of UI data for displaying a status during operation or actual data for ending the operation;
Conversion means for converting the data to be transferred in the memory space of the server device into a transferable state;
A screen sharing system comprising: transmission means for transmitting data converted by the conversion means to the client device. A client device and a server device are connected via a network, the server device transfers at least part of screen information to the client device, and the client device displays the transferred screen information as a shared area on the screen, A screen sharing system for performing remote operation of the server device from the client device by transferring the input event information generated for the shared area to the server device and reproducing the transferred input event information. Because
The client device is
Detecting means for detecting an instruction for data transfer to the shared area;
A determination means for determining which of UI data for displaying an operating state or actual data for ending an operation;
Conversion means for converting data to be transferred in the memory space of the client device into a transferable state;
Transmission means for transmitting the data converted by the conversion means to the server device,
The server device
Receiving means for receiving data transferred from the client device;
A screen sharing system comprising: expansion means for expanding data received by the reception means in a memory space of the server device. A client device and a server device are connected via a network, the server device transfers at least part of screen information to the client device, and the client device displays the transferred screen information as a shared area on the screen, A screen sharing system for performing remote operation of the server device from the client device by transferring the input event information generated for the shared area to the server device and reproducing the transferred input event information. Because
The client device is
Detecting means for detecting an instruction to transfer data from a shared area displaying the screen of the server device to another shared area displaying the screen of another server device;
Means for requesting the server device to transfer data to another server device,
The server device
A determination means for determining whether to transfer UI data for displaying a status during operation or actual data for ending an operation upon receiving a data transfer request from the client;
Conversion means for converting the data to be transferred in the memory space of the server device into a transferable state;
Transmitting means for transmitting the data converted by the converting means to another server device;
A means for requesting data transfer to the other server device when it is determined that the determination means transfers actual data;
Other server devices
Receiving means for receiving data transferred from the server device;
A screen sharing system comprising: expansion means for expanding data received by the reception means in a memory space of another server device. The detection means considers the data transfer instruction when a drag operation is performed from or to the shared area,
4. The screen sharing system according to claim 1, wherein the expansion unit expands data received by the reception unit in a memory space. 5. The detection means regards the data transfer instruction when copying to the clipboard is performed,
4. The screen sharing system according to claim 1, wherein the expansion unit expands data received by the reception unit in a memory space. 5. The detection means regards the data transfer instruction when a double-click is performed on an object,
4. The screen sharing system according to claim 1, wherein the expansion unit expands data received by the reception unit in a memory space. 5. The detection means considers the data transfer instruction when a selection operation is performed on an object,
4. The screen sharing system according to claim 1, wherein the expansion unit expands data received by the reception unit in a memory space. 5.   When the conversion unit receives a data transfer request from the client device, the conversion unit generates an event in the server device, and acquires the data in the memory space of the server device by processing the event. The screen sharing system according to claim 1.   When the conversion unit receives a data transfer request from the client device, the conversion unit generates an event in the server device, and acquires the data in the memory space of the server device by processing the event. The screen sharing system according to claim 3.   10. The data according to claim 8, wherein the data is acquired by generating an event after generating a window under the cursor in the server device, and processing the generated event in the generated window. The screen sharing system described. A client device and a server device are connected via a network, the server device transfers at least part of screen information to the client device, and the client device displays the transferred screen information as a shared area on the screen, A screen sharing system for performing remote operation of the server device from the client device by transferring the input event information generated for the shared area to the server device and reproducing the transferred input event information. Data transfer method,
In the client device,
A detection step of detecting an instruction for data transfer from the shared area;
A requesting step for requesting data transfer to the server device;
A receiving step for receiving data transferred from the server device;
Expanding the data received in the receiving step in the memory space of the client device,
In the server device,
When receiving a data transfer request from the client device, a determination step of determining which UI data for displaying a status during operation or actual data for ending the operation is transferred;
A conversion step of converting the data to be transferred in the memory space of the server device into a transferable state;
And a transmission step of transmitting the data converted in the conversion step to the client device. A client device and a server device are connected via a network, the server device transfers at least part of screen information to the client device, and the client device displays the transferred screen information as a shared area on the screen, A screen sharing system for performing remote operation of the server device from the client device by transferring the input event information generated for the shared area to the server device and reproducing the transferred input event information. Data transfer method,
In the client device,
A detection step of detecting an instruction to transfer data to the shared area;
A determination step of determining which of UI data for displaying a status during operation or actual data for ending the operation;
A conversion step of converting data to be transferred in the memory space of the client device into a transferable state;
A transmission step of transmitting the data converted in the conversion step to the server device,
In the server device,
A receiving step of receiving data transferred from the client device;
A data transfer method comprising: a data expansion method for expanding the data received in the reception step into a memory space of the server device. A client device and a server device are connected via a network, the server device transfers at least part of screen information to the client device, and the client device displays the transferred screen information as a shared area on the screen, A screen sharing system for performing remote operation of the server device from the client device by transferring the input event information generated for the shared area to the server device and reproducing the transferred input event information. Data transfer method,
In the client device,
A detection step of detecting an instruction for data transfer from the shared area displaying the screen of the server device to another shared area displaying the screen of the other server device;
Requesting the server device to transfer data to another server device,
In the server device,
When receiving a data transfer request from the client, a determination step of determining which of UI data for displaying a status during operation or actual data for ending the operation;
A conversion step of converting the data to be transferred in the memory space of the server device into a transferable state;
A transmission step of transmitting the data converted in the conversion step to another server device;
A means for requesting data transfer to the other server device when it is determined that the determination means transfers actual data;
To other server devices,
A receiving step for receiving data transferred from the server device;
A data transfer method comprising: a data expansion step of expanding the data received in the reception step into a memory space of another server device.   A program for causing a computer to execute each step of the data transfer method according to any one of claims 11 to 13.   The computer-readable recording medium which recorded the program of Claim 14.

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