JP2011204089A - Screen data distribution system, server, client terminal, screen data distribution method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the display time of the result of a window switching operation.SOLUTION: A screen data distribution system sends out display data that the server is to display through a network to the client terminal and makes the client terminal display them. Before the entire windows are displayed, the server sends out the image data of a window having an area which is not displayed since the plurality of windows are superimposed and displayed on a screen among the plurality of windows that the server is to display.

Description

  The present invention relates to a screen data distribution system, a server, a client terminal, a screen data distribution method, and a program.

  In the client system that transfers the screen data of the server display unit to the client terminal and displays it on the display unit of the client terminal, not the full screen data displayed on the display unit of the server but the currently displayed screen and one sheet There is a method of transmitting only the difference data from the previously sent screen (see, for example, Patent Document 1).

  The invention described in Patent Document 1 relates to a “screen data transmission apparatus”, specifically, “each of a plurality of blocks included in a first screen frame is preceded by the first screen frame. Difference detection means for detecting whether or not there is a difference of a predetermined amount or more with a block at a corresponding position included in the second screen frame, and data of a block for which the detection result of the difference detection means is positive Before transmitting the first screen frame to the detection by the difference detecting means, a certain block included in the first screen frame, and included in the second screen frame; At least one pixel of the certain block included in the first screen frame so that a difference of the predetermined amount or more is generated between the block at the corresponding position and the block at the corresponding position. Comprising a pixel level changing means for changing the level, the "is intended.

  FIGS. 9A to 9C are explanatory diagrams for explaining screen blocks transferred in the screen transfer type thin client system. FIGS. 10A to 10C are screen transfer type thin client systems. It is explanatory drawing for demonstrating the screen block transferred in FIG.

  For example, when the nth frame is as shown in FIG. 9A and a new Window (hereinafter referred to as a window) 701 appears as shown in FIG. 9B in the (n + 1) th frame, The screen data of the block group 703 including the window 701 as shown in FIG. 9C is encoded and transmitted.

  Further, for example, when the automobile 705 is in the position shown in FIG. 10A in the nth frame and in the position shown in FIG. 10B in the (n + 1) th frame, FIG. The screen data of the block group 707 including the background after the automobile 705 has run away and the block group 709 newly including the automobile 705 are encoded and transmitted.

Here, “window” refers to, for example, a function for displaying a small rectangular screen (display area) that is independent of each other in the operation screen of a personal computer and displaying an image or document in the screen or the rectangular shape. Refers to the display area. This is a display method generally used in OSs for personal computers such as Windows (registered trademark) and Mac (registered trademark) OS (Operation System).
The design and function of the window differ depending on the OS and application software, but usually has a title bar, and has a button for adjusting the size and a button for closing the window. Individual windows can be moved freely, resized, or displayed in layers by the user.

  According to the invention described in Patent Document 1, since it is possible to transmit screen block data that does not have a difference greater than or equal to a predetermined difference, the state is deteriorated because there are many screen blocks that have a difference greater than or equal to a predetermined difference. It is possible to re-send the screen transmitted in step 1 to the thin client side with high image quality.

JP 2009-224847 A

By the way, in the invention described in Patent Document 1, there are some cases where many differences are generated by operating a window of an application executed by the server device. That is,
(1) Operation to change the window to be displayed on the front,
(2) Operation to close or minimize the window displayed on the front,
(3) An operation to move the window displayed on the front to display the window located on the back.
Is mentioned.
As shown in FIG. 10, in the system that displays the windows 110 and 120 on the display data 100 of the display unit, and captures the entire screen and sends the difference data, the window changing operation, the closing operation, the minimizing operation, and the moving operation are performed. If this is done, the change area becomes large, the amount of data becomes large, and the display of the operation result becomes slow or deteriorates.

  Accordingly, an object of the present invention is to provide a screen data distribution system, a server, a client terminal, a screen data distribution method, and a program that can shorten the display time of the result of the window switching operation.

  In order to solve the above problem, the invention described in claim 1 is a screen data distribution system for sending display data to be displayed by a server to a client terminal via a network and displaying the display data on the client terminal. The server is configured to display image data of a window having a non-display area by overlapping the plurality of windows displayed on the screen among the plurality of windows to be displayed by the server. Sending before the entire window is displayed.

  According to a second aspect of the present invention, in the first aspect of the invention, the server sends identification information for identifying the plurality of windows to the client terminal.

  According to a third aspect of the present invention, in the second aspect of the present invention, the server includes notification means for notifying the client terminal of the display order of the windows, and transmission means for transmitting the window data. The client terminal comprises receiving means for receiving the data of the window during standby of the network, and a plurality of windows are displayed on the display means based on the display order of the windows and the identification information notified from the server. It is characterized by being displayed in a superimposed manner.

  The invention according to claim 4 is the invention according to claim 1 or 2, wherein the server captures a screen to be displayed by the server, display data captured by the screen capture unit, and An encoder unit that encodes window image data into transmission data; and a transmission unit that transmits the transmission data to the client terminal. The transmission data is decoded and displayed or stored in a screen data buffer. And an identifier for identifying the encoded window, and encoded window data.

  The invention described in claim 5 is the screen data buffer according to claim 3, wherein the server captures and stores image data of a window not displayed in the foreground when the difference area is smaller than a predetermined value. And another buffer for storing the image data of the captured window as a type flag, and a value for identifying the captured window is further designated as another identifier.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the server is located on the back of another window and displays so that the hidden window is exposed. When switched, a command is transmitted so that the data of the foremost window in the screen data buffer is displayed on the client terminal.

  According to a seventh aspect of the invention, in the sixth aspect of the invention, when the client terminal receives the command, the client terminal searches the screen data buffer and uses the identifier as a key for the hidden window. Data is acquired and displayed on the display means.

  The invention according to claim 8 is the invention according to claim 7, wherein the server applies the data of the window acquired from the screen buffer to the area of the non-displayed window, and detects the difference area. The difference area is encoded, and data is transmitted to the client terminal.

  The invention according to claim 9 is the present invention according to any one of claims 1 to 8, wherein the display means of the client terminal cuts out a part of the window sent from the server and partially displays it. It is characterized in that data of an area in contact with the displayed window is transmitted in advance.

  The invention according to claim 10 is a server used in a screen data distribution system for sending display data to be displayed by a server to a client terminal via a network and displaying the display data on the client terminal. Of the plurality of windows to be displayed by the server, the plurality of windows are superimposed and displayed on the screen, so that the image data of the window having an area that is not displayed is displayed on the entire window. It is characterized by comprising a transmission means for sending before the message is displayed.

  The invention according to claim 11 is a screen data distribution method in which display data to be displayed by a server is transmitted to a client terminal via a network and displayed on the client terminal. Among the plurality of windows to be displayed, the plurality of windows are superimposed and displayed on the screen, so that the entire image data of the window having the non-displayed area is displayed. It is characterized by sending before.

  The invention described in claim 12 is directed to a computer of a screen data distribution system for sending display data to be displayed by a server to a client terminal via a network and displaying the display data on the client terminal. Among a plurality of windows to be displayed, a procedure for superimposing and displaying the plurality of windows on the screen, and displaying image data of a window having a non-display area before the entire window is displayed A procedure for sending out is executed.

  The invention according to claim 13 is directed to the computer of the client terminal of the screen data distribution system for sending the display data to be displayed by the server to the client terminal via the network and displaying the display data on the client terminal. A procedure for receiving the data of the window during standby of the network, a procedure for displaying the window in a superimposed manner so that a part of the plurality of windows is exposed based on the display order of the window notified from the server; It is made to perform.

  According to the present invention, it is possible to provide a screen data distribution system, a server, a client terminal, a screen data distribution method, and a program that can shorten the display time of the result of the window switching operation.

It is a block diagram which shows one Embodiment of the screen data delivery system which concerns on this invention. It is an example of the block diagram of the transmission data 400 used for the screen data delivery system shown in FIG. (A)-(d) is an example of the screen displayed on the display part of the client terminal of the screen data delivery system shown in FIG. It is an example of the sequence diagram which shows operation | movement of the screen delivery system shown in FIG. It is another example of the sequence diagram which shows operation | movement of the screen delivery system shown in FIG. (A), (b) is another example of the screen displayed on the display part of the client terminal of the screen data delivery system shown in FIG. It is another example of the sequence diagram which shows operation | movement of the screen delivery system shown in FIG. (A)-(c) is explanatory drawing which shows other embodiment of the screen data delivery system which concerns on this invention. (A)-(c) is explanatory drawing for demonstrating the screen block transferred in a screen transfer type thin client system. (A)-(c) is explanatory drawing for demonstrating the screen block transferred in a screen transfer type thin client system.

Embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
<Configuration>
FIG. 1 is a block diagram showing an embodiment of a screen data distribution system according to the present invention.
The system shown in FIG. 1 includes a server 200, a network 260, and a client terminal 300.
The server 200 includes a control unit 210, a screen capture unit 220, an encoder unit 230, a transmission unit 240, and a screen data buffer 250.

  The control unit 210 as a notification unit has a function of performing overall control of the server 200, and includes, for example, a microprocessor. The control unit 210 causes the screen capture unit 220 to capture the screen displayed by the server 200, encodes the captured display data using the encoder unit 230, and transmits the encoded transmission data 400 from the transmission unit 240 to the client terminal 300. .

  Here, the “desktop” is a basic operation screen displayed when an OS such as Windows (registered trademark) or Mac (registered trademark) is started. This desktop can be used to operate files and start application software.

FIG. 2 is an example of a configuration diagram of transmission data 400 used in the screen data distribution system shown in FIG.
As shown in FIG. 2, to identify the encoded window and an identification flag 410 (for example, D, P) indicating whether the transmission data 400 is immediately decoded and displayed or stored in the screen data buffer 350. Identifier 420 (0x00000000, 0x00000001,0x0000002, etc.) and encoded screen data 430 are included.

When the difference area is small, the control unit 210 of the server 200 captures display data of the window 120 that is not displayed in the foreground (image data of the window 120), and stores the captured image data in the screen buffer 25. , Encoded and transmitted to the client terminal 300. At this time, the transmission data of the window 120 is designated to be stored in the screen data buffer 350 as a type flag, and a value for identifying the window 120 is designated in the identifier 420.
Here, there are two types of “capture”: “capture” for storing display data displayed on the display unit and “capture” for storing image data of a window constituting a part of the screen.

  The screen capture unit 220 has a capture function for capturing display data of the entire screen. Further, the screen capture unit 220 has a function of capturing window image data. Each function may be independent. Each may be realized by software. In this case, the capture process is performed by the control unit 310.

  The encoder unit 230 has a function of encoding display data captured by the screen capture unit 220 and a function of encoding image data obtained by capturing window image data. The encoder unit 230 may be realized by software. In this case, the control unit 210 executes the encoding process.

  The transmission unit 240 serving as a transmission unit has a function of transmitting encoded display data and window image data to the network 260.

  The screen data buffer 250 has a function of storing captured window image data, and includes, for example, an HDD (Hard Disk Drive).

  The client terminal 300 includes a control unit 310, a reception unit 320, a decoder unit 330, a display unit 340, and a screen data buffer 350.

When the client terminal 300 is designated to be displayed immediately in the type flag 410, the screen data 430 is decoded by the decoder unit 330 and displayed on the display unit 340.
When the type flag 410 is designated to be stored in the screen data buffer 350, the screen data decoded by the decoder unit 330 is stored in the screen data buffer 350.

  The control unit 310 has a function of comprehensively controlling the client terminal 300, and includes, for example, a microprocessor.

  The receiving unit 320 has a function of receiving display data and window image data data transmitted from the server 200 via the network 260.

  The decoder unit 330 has a function of decoding the received display data and window image data. Note that the decoder unit 330 may be realized by software. In this case, the control unit 310 executes a decoding process.

  A display unit 340 as a display unit displays the display data decoded by the decoder unit 330. For example, the window has a function of displaying the window so that a part of the window is exposed. For example, a liquid crystal display panel (or a plasma display or an organic EL (EL) display) can be used.

  The screen data buffer 350 has a function of storing decoded window image data, and includes, for example, an HDD (Hard Disk Drive).

<Operation>
Next, the operation of the screen data distribution system shown in FIG. 1 will be described.
3A to 3D are examples of screens displayed on the display unit of the client terminal of the screen data distribution system illustrated in FIG.

The screen data distribution system distributes display data of the entire screen of the server 200 to the client terminal 300 via the network 260.
The display data of the entire screen may be composed of a plurality of windows, and the windows may be displayed so as to be partially exposed on the display unit 340 of the client terminal 300.

  That is, as shown in FIG. 3A, the window 110 is superimposed and displayed on the desktop 100 of the display unit of the client terminal on the window 120 so that a part of the window 120 is exposed. The portion shown in FIG. 3D of the window 120 is a non-display area located on the back surface of the window 110 shown in FIG. 3B and is not displayed on the desktop 100.

In the screen distribution system, the display state of the window 120 changes. Before the display area expands (for example, the entire window 120 is displayed) (the entire window 120 is displayed), the server 200 notifies the client terminal 300 of the window display order and transmits the window image data. .
For example, the transmission may be performed when there is little update of display data (not display data) transmitted from the server to the client terminal and captured.
Since the updated area (rectangle) is extracted as in Patent Document 1, when there are few updates, there is a network bandwidth, which is convenient for sending data.
In this screen distribution system, the server 200 notifies the client terminal 300 of the window display order using the time (for example, several seconds) while the user operates the mouse and keyboard (both not shown). The client terminal 300 receives the window data while waiting for the network, and a part of the plurality of windows is exposed on the display unit based on the window display order notified from the server 200. Is superimposed and displayed.

  During mouse operation and keyboard operation, there is little data flowing through the network, and a general 100BASE-TX network has a margin of 100 Mbit / s. Conventionally, even if the network is free, it waits as it is, but this application uses this free state of the network to send window data from the server to the client terminal and to notify the transmission from the server to the client terminal. It is.

  As described above, the time for displaying the result of the switching operation can be reduced by notifying the client terminal in advance of the screen having the area that is not displayed by being displayed in a superimposed manner.

FIG. 4 is an example of a sequence diagram showing the operation of the screen distribution system shown in FIG.
The sequence diagram shown in FIG. 4 shows the case where the screen is not switched and the area of the change region (the region that is located behind the other window and is not displayed) is equal to or larger than the threshold value. ) To (d).

  Here, when sending screen data using the network 260, assuming that the network 260 is a 100BASE-TX speed 100 Mbit / s network and 10 images are sent per second, the amount of data per frame is 10M bits. Using this value as a threshold value, image data is sent from the server to the client terminal when the amount of data is small compared to this threshold value.

First, when the control unit 210 of the server 200 requests the screen capture unit 220 to capture display data (step S1), the screen capture unit 220 captures display data that is the screen of the entire desktop (step S2).
When the display data that is the screen of the entire desktop is captured, the capture data is sent to the control unit 210 (step S3).
The control unit 210 detects the previous screen and the evaluation area (step S4), and makes an encoding request to the encoder unit 230 (step S5).
The encoder unit 230 performs encoding and sends the encoded data to the control unit 210 (step S6).
The control unit 210 makes a transmission request to the transmission unit 240 (step S7), and the transmission unit 240 transmits the transmission data 400 to the reception unit 320 of the client terminal (step S8).

The receiving unit 320 sends the transmission data to the control unit 310 (step S9), and the control unit 310 makes a decoding request to the decoder unit 330 (step S10).
The decoder unit 330 sends the decoded data to the control unit 310, the control unit 310 sends a display request to the display unit 340 (step S11), and the display unit 340 displays the window shown in FIG. At this time, since the data of the area (FIG. 3D) which is located behind the window 110 and is not displayed is not transmitted, the display time can be shortened when the user operates. .

FIG. 5 is another example of a sequence diagram showing the operation of the screen distribution system shown in FIG.
The sequence diagram shown in FIG. 5 shows a case where the screen is not switched and the area of the change region (the region that is located behind the other window and is not displayed) is less than the threshold value. ) To (d).
When the control unit 210 of the server 200 makes a capture request to the screen capture unit 220 (step S21), the screen capture unit 220 captures a specified window image that constitutes a part of the screen (step S22). The captured image data is sent to the control unit 210 (step S23).
The control unit 210 makes an encoding request to the encoder unit 230 (step S24), and the encoder unit 230 sends the encoded data to the control unit 210 (step S25).
The control unit 210 makes a transmission request to the transmission unit 240 (step S26), and the transmission unit 240 responds to the control unit 210 and transmits the transmission data 400 to the reception unit 320 of the client terminal 300 (step S27).

When receiving the transmission data to the control unit 310 (step S28), the receiving unit 320 responds to the receiving unit 320 and makes a decoding request to the decoder unit 330 (step S29).
When the decoder unit 330 responds to the control unit 310, the control unit 310 makes a data storage request to the screen data buffer 350 (step S30).

By performing the above operation, the display time during the window switching operation can be shortened.
In the present embodiment, the case where the display between the window 110 displayed on the front and the window 120 displayed on the back is switched has been described. However, the present invention is not limited to this, and the window 110 is not limited thereto. The same applies to the case where the window 120 is displayed as a whole, or the window 110 is minimized, closed, or changed to a state where the window 120 is displayed as a whole.

[Second Embodiment]
6A and 6B are other examples of the screen displayed on the display unit of the client terminal of the screen data distribution system shown in FIG.
When the window is switched from the state shown in FIG. 6A to the state shown in FIG. 6B, the control unit 210 of the server 200 displays the image data of the window 120 in the data buffer 350 on the screen of the client terminal 300. Send the command to
The control unit 310 of the client terminal 300 searches the screen data buffer 350, acquires the image data of the window 120 as the identifier 420, and displays it on the display unit 340.

  The server 200 applies the screen data of the window 120 acquired from the screen data buffer 250 to the area of the window 120, detects the difference area, encodes the difference area, and transmits the display data to the client terminal 300.

FIG. 7 is another example of a sequence diagram showing the operation of the screen distribution system shown in FIG.
The sequence diagram shown in FIG. 7 shows a case where the screen is switched and the area of the change area (the area that is located behind the other window and is not displayed) is equal to or larger than the threshold value. , (B).
The control unit 210 of the server 200 requests the transmission unit 240 to display the reception data buffer (step S41), and the transmission unit 240 requests the reception unit 320 of the client terminal 300 to display the reception data buffer (step S42). When the receiving unit 320 sends a signal to the control unit 310, the control unit 310 acquires window data in the screen data buffer 350 (step S43), and the screen data buffer 350 sends window data to the control unit 310. Makes a display request to the display unit 340 (step S44), and in response to this, the display unit 340 displays a window. At the same time, the control unit 210 of the server 200 sends a window data acquisition request to the screen data buffer 250 (step S45), and the screen data buffer 250 responds to the control unit.

When the control unit 210 of the server 200 combines the acquired window with the reference screen (step S46) and requests the screen capture unit 220 to capture display data (step S47), the screen capture unit 220 captures the desktop (step S47). In step S48, display data capture data is sent to the control unit 210 (step S49).
The control unit 210 detects the reference screen and the evaluation area (step S50), makes an encoding request to the encoder unit 230 (step S51), and the encoder unit 230 sends the encoded data to the control unit 210 (step S52).
The control unit 210 makes a transmission request to the transmission unit 240 (step S53), and the transmission unit 240 transmits the transmission data 400 to the reception unit 320 of the client terminal 300 (step S54).
The receiving unit 320 sends transmission data to the control unit 310 (step S55), and the control unit 310 sends a response signal to the receiving unit 320 and makes a decoding request to the decoder unit 330 (step S56).
When the decoder unit 330 sends the decoded data to the control unit 310, the control unit 310 makes a display request to the display unit 340 (step S57), and the display unit 340 displays a window based on the decoded data.

  By performing the above operation, the display time during the window switching operation can be shortened.

[Third Embodiment]
FIGS. 8A to 8C are explanatory views showing another embodiment of the screen data distribution system according to the present invention.
The difference of the third embodiment from the first embodiment is that the client terminal cuts out and displays part of the window data from the server.
If the resolution of the client terminal is lower than that of the server, or if the screen size is small (for example, 10-inch or less) as in a mini-notebook computer, for example, the upper left quarter of the window from the server This is the case that only can be displayed.

Of the server window shown in FIG. 8A, areas A1 and A2 are first displayed on the display unit of the client terminal, and the area A3 is displayed from the server to the client terminal while the user is scrolling by mouse operation or keyboard operation. Are transmitted, and the data of the area A3 is notified to be transmitted.
Thereby, the display time at the time of the window switching operation can be shortened.

  In the above, in a system that transmits difference data, the amount of data transmitted by the user's window operation varies greatly (for example, the amount of difference data increases when the window is maximized or minimized). If there is little, you can afford the network bandwidth. The operability of the client terminal can be improved by transmitting screen data that may be displayed next while the network bandwidth is sufficient.

<Program>
The screen data distribution system according to the present invention described above is realized by a program that causes a computer to execute processing. Examples of the computer include general-purpose computers such as personal computers and workstations, but the present invention is not limited to this. Therefore, as an example, a case where the present invention is realized by a program will be described below.

  The display data that the server is trying to display is sent to the client terminal via the network, and the computer of the screen data distribution system that is displayed on the client terminal, among the multiple windows that the server is trying to display, A server program that executes a procedure for superimposing a plurality of windows on a screen and a procedure for sending image data of a window having a non-displayed area before the entire window is displayed. .

  Also, the display data to be displayed by the server is sent to the client terminal via the network and displayed on the client terminal. There is a client terminal program for causing the display unit to execute the procedure for receiving the data and the procedure for the display means to superimpose and display a plurality of windows based on the display order of the windows notified from the server.

Accordingly, the screen data distribution system according to the present invention can be realized anywhere as long as there is a computer environment in which the program can be executed.
Such a program may be stored in a computer-readable storage medium.
<Storage medium>
Here, examples of the storage medium include computer-readable storage media such as a CD-ROM (Compact Disc Read Only Memory), a flexible disk (FD), a CD-R (CD Recordable), and a DVD (Digital Versatile Disk). , Flash memory, RAM (Random Access Memory), ROM (Read Only Memory), semiconductor memory such as FeRAM (ferroelectric memory), and HDD (Hard Disc Drive).

  The above-described embodiment shows an example of a preferred embodiment of the present invention, and the present invention is not limited thereto, and various modifications can be made without departing from the scope of the invention. is there.

200 Server 210, 310 Control unit 220 Screen capture unit 230 Encoder unit 240 Transmission unit 250, 350 Screen data buffer 260 Network 300 Client terminal 320 Reception unit 330 Decoder unit 340 Display unit 400 Transmission data

Claims (15)

A screen data distribution system for sending display data to be displayed by a server to a client terminal via a network and displaying the data on the client terminal,
The server
Of the plurality of windows to be displayed by the server, the plurality of windows are superimposed and displayed on the screen, so that the image data of the window having a non-displayed area is displayed as a whole. A screen data distribution system characterized by being sent out before being displayed. The server
2. The screen data distribution system according to claim 1, wherein identification information for identifying the plurality of windows is sent to the client terminal. The server
Notification means for notifying the client terminal of the display order of the window, and transmission means for transmitting the data of the window,
The client terminal includes reception means for receiving the data of the window during standby of the network, and a plurality of windows are superimposed on the display means based on the display order of the window and the identification information notified from the server. The screen data distribution system according to claim 2, wherein the screen data distribution system is displayed. The server includes a screen capture unit that captures a screen to be displayed by the server, an encoder unit that encodes display data captured by the screen capture unit and image data of the window into transmission data, and the transmission data. A transmission unit for transmitting to the client terminal,
The transmission data includes an identification flag indicating whether to decode and display or save in a screen data buffer, an identifier for identifying an encoded window, and encoded window data. The screen data distribution system according to claim 1 or 2. The server captures and saves image data of a window not displayed in the foreground when the difference area is smaller than a predetermined value;
The captured image data of the window includes another buffer that is stored as a type flag,
4. The screen data distribution system according to claim 3, wherein a value for identifying the captured window is further designated as another identifier. When the client terminal is designated to be displayed in the type flag, a decoder unit that decodes the window data to be displayed on the display means;
5. A screen data buffer unit for storing window data decoded by the decoder unit when the type flag is specified to be stored in the screen data buffer. The screen data distribution system according to any one of the above.   When the server switches the display so that the non-displayed window located behind the other window is exposed, the data of the frontmost window in the screen data buffer is displayed on the client terminal. The screen data distribution system according to any one of claims 1 to 5, wherein a command is transmitted to the screen.   When the client terminal receives the command, the client terminal searches the screen data buffer, acquires the data of the hidden window using the identifier as a key, and displays the data on a display unit. The screen data distribution system according to claim 6.   The server applies the window data obtained from the screen buffer to the hidden window area, detects a difference area, encodes the difference area, and transmits the data to the client terminal. The screen data distribution system according to claim 7, wherein the screen data distribution system is a screen data distribution system.   The data of an area in contact with the currently displayed window is transmitted in advance when the display unit of the client terminal cuts out and partially displays a part of the window sent from the server. 9. The screen data distribution system according to any one of 1 to 8. A server used in a screen data distribution system for sending display data to be displayed by a server to a client terminal via a network and displaying the data on the client terminal,
The server
Of the plurality of windows to be displayed by the server, the plurality of windows are superimposed and displayed on the screen, so that the image data of the window having a non-displayed area is displayed as a whole. A server comprising transmission means for sending before being displayed. A client terminal used in a screen data distribution system for sending display data to be displayed by a server to a client terminal via a network and displaying the data on the client terminal,
The client terminal includes receiving means for receiving the data of the window during standby of the network, and displays the window so as to be partially exposed based on the display order of the window notified from the server. And the client terminal. A screen data delivery method in which display data to be displayed by a server is sent to a client terminal via a network and displayed on the client terminal.
The server
Of the plurality of windows to be displayed by the server, the plurality of windows are superimposed and displayed on the screen, so that the image data of the window having a non-displayed area is displayed as a whole. A screen data delivery method, wherein the screen data is sent before being displayed. Display data to be displayed by the server is sent to the client terminal via the network and displayed on the client terminal computer.
The server is
Among the plurality of windows that the server is trying to display, a procedure for superimposing the plurality of windows to be displayed on the screen,
A procedure for sending image data of a window having a non-display area before the entire window is displayed;
A server program characterized in that is executed. Display data to be displayed by the server is sent to the client terminal via the network and displayed on the client terminal in the client terminal computer of the screen data distribution system.
A receiving means for receiving the data of the window while waiting for the network;
A procedure in which the display means superimposes and displays a plurality of windows based on the display order of the windows notified from the server so that a part of the windows is exposed;
A program for a client terminal, characterized in that

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