JP2010237726A - Information processor, parameter setting method, program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust a parameter of compression without user operation, in a system for compressing data formed based on an application program started on a server side to be transmitted to a client side. <P>SOLUTION: The information processor sets a parameter related to data compression according to the application being used in an information processor that receives compression data. Concretely, the processor includes: an application detection means which detects the application being used in the information processor that receives compression data; a parameter information holding means which holds a parameter related to data compression in association with information on application; and a parameter setting means for reading a parameter corresponding to information on the application in use which has been detected by the application detection means, and sets it as the parameter used for data compression. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an information processing apparatus, a parameter setting method thereof, a program, and a recording medium, and more particularly to a technique that is preferably applied to transfer of screen data in a thin client system.

  In recent years, there has been a thin client system in which only the minimum functions are provided on the client side, resources such as application programs and files are collectively managed on the server side, and applications and files are accessed remotely from the client side. Attention has been paid. A terminal on the client side (thin client terminal) in the thin client system does not have a storage device such as a hard disk device by preventing application programs and files other than the remote operation program from being saved.

  When working on the thin client terminal, start the server side application program by operating the keyboard and mouse on the thin client side, create screen data displayed on the thin client terminal based on the application, The screen data is transmitted to the thin client terminal by remote control. Information such as operation data (keystrokes, mouse clicks, etc.) from the thin client terminal and application screen data from the server flows through the network connecting the thin client terminal and the server.

  Here, the transmission method of the screen data displayed on the thin client terminal detects the updated part of the screen at the server, compresses and transmits the updated screen data, and the thin client terminal receives this to display the screen. Update the screen by setting it as information. By such a screen data transmission method, only the updated difference information is transferred, and a device for reducing the amount of data transferred on the network is devised.

  For example, in Patent Document 1, a transparent color is set in the video display area on the thin client server side and transmitted as screen data via a remote controller, and at the same time, the video data is transmitted via another route, and these screens are transmitted on the thin client terminal side. A thin client system is disclosed in which data and video data are displayed on the same screen in an overlay display so that high-quality video can be reproduced as a TV phone terminal or a TV conference terminal.

JP 2007-31957 A

  In the screen data transmission method as described above, compression parameters may be adjusted depending on the contents of application programs to be used, the purpose of use, and the network status (line speed, etc.). However, in such a case, it is necessary for the user to manually adjust the compression parameters optimally in accordance with the communication environment, the purpose of use, and the like. In particular, when multiple types of different application programs are started up and used at the same time, in order to use each application program in an optimal state, the application program to be used is switched in order to set an optimal compression parameter. Each time, the user has to reset the optimum compression parameter, which is inconvenient.

  The technique disclosed in Patent Document 1 realizes high-quality video reproduction in a thin client system, but does not deal with user inconvenience in adjusting compression parameters according to the application program and network conditions. Absent.

  Accordingly, an object of the present invention is to enable compression parameters to be adjusted without a user's hand in a system in which data created based on an application program started on the server side is compressed and transferred to the client side. And

  An information processing apparatus according to an aspect of the present invention sets parameters related to data compression in accordance with an application being used in an information processing apparatus to which compressed data is transferred. Specifically, application detection means for detecting an application in use in the information processing apparatus to which the compressed data is transferred, parameter information holding means for holding data compression parameters and application information in association with each other, and application detection Parameter setting means for reading out the parameter corresponding to the information of the application in use detected by the means from the parameter information holding means and setting it as a parameter used for data compression.

  An information processing apparatus parameter setting method according to an aspect of the present invention relates to an application detection step of detecting an application being used in an information processing apparatus to which compressed data is transferred, and associates parameters related to data compression with application information A parameter setting step of reading out a parameter corresponding to the information of the application in use detected by the application detection unit from the storage unit for storing the parameter, and setting the parameter as a parameter used for data compression.

  An information processing apparatus parameter setting method according to an aspect of the present invention includes: an application detection process for detecting an application being used in an information processing apparatus to which compressed data is transferred to a computer; and parameter and application information regarding data compression And a parameter setting process for reading out a parameter corresponding to the information of the application in use detected in the application detection process and setting it as a parameter used for data compression.

  A recording medium according to one aspect of the present invention is a computer-readable recording medium on which the above program is recorded.

  ADVANTAGE OF THE INVENTION According to this invention, in the system which compresses the data produced based on the application program started by the server side and transfers to the client side, it becomes possible to adjust the parameter of compression irrespective of a user's hand.

It is the figure which showed the structure of the thin client system as embodiment of this invention. It is the figure which showed the outline | summary of the display screen image and compression parameter setting of the client apparatus in embodiment of this invention. It is the figure which showed the example of the application parameter in embodiment of this invention. It is the figure which showed the relationship of the compression parameter which determines the relationship between the image quality in the case of compression, and the motion of an image. It is the figure which showed the relationship between a screen motion, UI input, and a buffer amount. It is the flowchart which showed the flow of the compression parameter setting process in embodiment of this invention. It is the figure which showed the example (update example) of the application parameter in embodiment of this invention. It is the flowchart which showed the flow of the compression parameter setting process in embodiment of this invention. It is the flowchart which showed the flow of the compression parameter setting process in embodiment of this invention. It is a figure for demonstrating the band allocation to the active window in embodiment of this invention. It is a figure for demonstrating the compression parameter setting (modification) in embodiment of this invention. It is the figure which showed the compression parameter setting process and data flow in embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of a thin client system as an embodiment of the present invention. The thin client system of this embodiment is configured by connecting a client device 100 and a server device 200 via a network 300. The network 300 is, for example, the Internet, a LAN, a wireless LAN, or the like.

  The client device 100 includes a data transmission / reception unit 101, a compressed data expansion unit 102, an image data display unit 103, and a user interface unit 104.

  The data transmission / reception means 101 exchanges various data via the server device 200 and the network 300. Specifically, the compressed image data is received from the server apparatus 200, and operation data (keystroke, mouse click, etc.) by the user interface means 104 is transmitted to the server apparatus 200. The compressed data decompression unit 102 decompresses the compressed image data received from the data transmission / reception unit 101 from the server device 200. The image data display unit 103 displays a screen of the image data expanded by the compressed data expansion unit 102. The user interface means 104 includes input means such as a keyboard and a mouse, and acquires operation data by the user such as keystrokes and mouse clicks.

  The server apparatus 200 includes a data transmission / reception unit 201, a transmission rate detection unit 202, an active window monitoring unit 203, a compression parameter setting unit 204, an application parameter storage unit 205, an image data compression unit 206, a video change amount monitoring unit 207, a UI input monitoring. Means 208, application parameter update means 209, and user interface means 210.

  The data transmission / reception means 201 exchanges various data with the client apparatus 100 via the network 300. Specifically, the compressed image data is transmitted to the client device 100, and user operation data (keystroke, mouse click, etc.) is received from the client device 100. The transmission rate detection unit 202 monitors the data transmission rate of the data transmission / reception unit 201 and monitors the bandwidth of the network.

  The active window monitoring unit 203 monitors the currently active window in the client device 100 and grasps information about the application name, window position, and size. The compression parameter setting unit 204 obtains the application name of the active window from the active window monitoring unit 203, obtains the compression parameter corresponding to the application from the application parameter storage unit 205, and the size, position information, and transmission of the active window. Based on the transmission speed information from the speed detection means 202, an optimum compression parameter is set in the image data compression means 206.

  The application parameter storage unit 205 stores optimum parameters for each application installed on the server device 200. The image data compression unit 206 captures image data (screen image) output from the server device 200 and compresses the screen image data according to the compression parameters.

  The video change amount monitoring unit 207 monitors the change amount of the video in the active window area within a predetermined time from the video information captured by the image data compression unit 206. The UI input monitoring unit 208 monitors input information of operations using a keyboard, a mouse, and the like in the currently active window. The application parameter update unit 209 generates an optimal compression parameter based on the video change information from the video change amount monitoring unit 207 and the UI input information from the UI input monitoring unit 208, and from the application parameter storage unit 205. The parameter corresponding to the application name of the active window is referenced, and if there is a difference in the generated parameter value, the parameter value of the application is updated. The user interface unit 210 provides an interface with the user when the user manually inputs setting values to the compression parameter setting unit 204 and the application parameter update unit 209.

  Although not shown, the server device 200 is a computer that includes a CPU, a memory, an input / output device, and the like and operates by program control. The server stores a program in which operation processing unique to the present invention stored in the memory is described. 1 is read and stored in the main memory (compression parameter setting unit 204, image data compression unit 206, active window monitoring unit 203, video change amount monitoring unit 207, UI input monitoring unit 208, application parameter updating unit). 209, transmission rate detection means 202, etc.). Each means can be realized by software as described above, but can also be realized by hardware by configuring each unit with a circuit.

  First, a process for adjusting the compression parameter according to the application will be described. In this embodiment, a compression parameter that is optimal for the application being used in the client device is automatically set. When a plurality of applications are used, the currently active window application is selected, and the compression parameter optimum for the application is automatically set.

  FIG. 2 is a diagram showing an overview of a display screen image and compression parameter setting of the client device 100 according to the present embodiment. In FIG. 2, the client apparatus 100 in the Windows (registered trademark) environment uses four applications: desktop, Web browser, OutLook (registered trademark), and Media Player.

  FIG. 3 is a diagram illustrating an example of application parameters (compression parameters for each application) in the present embodiment. As shown in FIG. 3, the application parameters are associated with the characteristics (image quality and movement), the operation subject, and parameter setting values for each application, and are held in the application parameter storage unit 205 as a data table. In the display example of FIG. 2, the characteristics of each application are as follows: desktop image quality is line drawing and small motion; Web browser image quality is text and motion is moving; OutLook (registered trademark) is image quality is text and motion is small; Media Player The image quality is video and the movement is large.

  In the present embodiment, the active window monitoring unit 203 detects the media player that is the currently active window application, and the compression parameter setting unit 204 sets the image quality motion setting value 3 as the compression parameter optimal for the media player. The buffer amount setting value 3 is read from the application parameter storage unit, and the read parameter is set in the image data compression unit 206.

  FIG. 4A is a diagram showing a relationship between compression parameters for determining a relationship between image quality and image motion with respect to a transmission rate given at the time of compression. In the present embodiment, five levels of values 1 to 5 are provided as setting values for image quality movement. The set values of 1 to 5 provide the user with a setting tendency as a setting parameter indicating whether the compression is to give priority to image motion or to give priority to image quality for a given transmission rate. It is. In other words, the setting value 1 is the highest image quality setting, and the closer to the setting value 1, the higher the image quality priority setting is. The installation value 5 is the movement highest priority setting, and the setting value 5 is the movement priority setting.

  In this embodiment, when the transmission rate is constant, a data compression rate corresponding to each setting value is determined in advance, and when the setting value is specified in the parameter setting, the data compression rate is determined, and the number of frames is accordingly set. The data compression rate and the number of frames are determined by calculation. As shown in FIG. 4A, the number of frames and the image quality are in a trade-off relationship. When the number of frames set as a parameter is large, the image quality becomes coarse and the movement of the image increases, while the number of frames is small. If it is small, the image quality becomes fine and the movement of the image becomes small.

  Although not shown in the figure, the buffer amount is the same as the image quality movement, and five values from 1 to 5 are set as setting values. These values are provided to the user as a guide. is there. That is, the numerical value of the buffer amount is determined in advance according to each set value, and the actual buffer amount is determined when the set value is designated by the parameter setting. The setting value (the numerical value of the buffer amount) for each application can be determined based on the following concept.

  FIG. 5 is a diagram showing the relationship between the screen movement and UI input and the buffer amount. The buffer amount is intended to be less affected by fluctuations in the line quality, and the buffer amount is increased in an application for viewing video or the like. For example, when using an application with a large screen movement and a small UI input, such as a video application or video browsing, the interactivity is not required, and the buffer amount to be set with a parameter becomes large in order to make the screen movement smooth. . Also, for example, when using an application with a large screen movement, such as a game or video editing, and a large UI input, it is necessary to be interactive. Further, for example, when an application such as E-mail or Word (registered trademark) with a small screen motion and a large amount of UI input is used, it is not necessary to show the screen motion smoothly.

  Specifically, processing is performed according to the flow shown in FIG. First, the power is turned on (step S101), and the activation of the application is detected (step S102). Then, the compression parameter setting unit 204 acquires a compression parameter corresponding to the detected application from the application parameter storage unit 205 (step S103). Then, the compression parameter setting unit 204 sets the acquired compression parameter in the image data compression unit 206 (step S104).

  While the power is on (step S105 / NO), the active window monitoring means 203 monitors whether the currently active window has changed (step S106). When detecting a change in the active window (step S106 / YES), the active window monitoring unit 203 acquires the application name of the active window after the change and notifies the compression parameter setting unit 204 (step S107). The application setting unit 204 acquires a compression parameter from the application parameter storage unit 205 based on the application name notified from the active window monitoring unit 203 (step S103), and sets it in the image data compression unit 206 (step S104).

  Next, processing for updating the application parameter in the application parameter storage unit according to the application usage status will be described. In the present embodiment, when the actual application usage by the user at the client device is different from the originally assumed state, the application parameters to be held are updated in accordance with the actual usage status.

  FIG. 7 is a diagram showing an example of application parameters in the present embodiment, and shows an example of updating parameters. As described above, the application parameters in the application parameter storage unit 205 are stored in association with the characteristics (image quality and motion), the operation subject, and parameter setting values for each application. The parameter setting value is determined as a standard value by default, but is corrected with a value reviewed from the difference between the user usage status and the assumed usage status. The information regarding the actual usage status of the user includes an image change amount (video change information) acquired by the video change amount monitoring unit 207 and a UI input amount (UI input information) acquired by the UI input monitoring unit 208. .

  For example, as an actual usage situation of Media Player, when the UI input amount acquired by the UI input monitoring unit 208 is as originally assumed and the change amount of the image acquired by the video change amount monitoring unit 207 is larger than expected, FIG. As shown in FIG. 5, the setting value of the image quality motion is changed from 3 to 5 and the setting value of the buffer amount is also changed from 3 to 4 so that the motion priority is set. Further, for example, as the actual usage status of the Web browser, the change amount of the image acquired by the video change amount monitoring unit 207 is as originally assumed, and the UI input amount acquired by the UI input monitoring unit 208 is larger than expected. As shown in FIG. 5, the buffer amount setting value is changed from 2 to 1 in order to improve the interactivity. In this way, the held application parameters are updated according to the actual application usage status by the user.

  Specifically, processing is performed according to the flow shown in FIG. First, the power is turned on (step S201), and the compression parameter setting unit 204 sets a compression parameter optimal for the activated application (step S202). This step S202 is a process corresponding to steps S102 to S104 of FIG. 6 described above, and thus detailed description thereof is omitted.

  Next, at a predetermined timing (step S203 / YES), the video change amount monitoring unit 207 and the UI input monitoring unit 208 acquire video change information and UI input information as user usage information (step S204). Then, the application parameter update unit 209 acquires video change information and UI input information from the video change amount monitoring unit 207 and the UI input monitoring unit 208, and generates an optimal compression parameter value based on these information. When the difference between the generated parameter value and the parameter value in the application parameter storage unit 205 is equal to or greater than a predetermined threshold (step S205 / YES), the application parameter update unit 209 updates the compression parameter using the generated parameter value. (Step S206).

  Except for the timing of updating the compression parameter (step S203 / NO), the compression parameter is adjusted according to the change of the active window. That is, when the active window monitoring unit 203 detects a change in the active window (step S208 / YES), the application setting unit 204 sets a compression parameter optimal for the active window after the change (step S209). This step S209 is a process corresponding to step S107 and step S103 to step S104 of FIG. 6 described above, and detailed description thereof is omitted.

  Next, processing for adjusting the compression parameter according to the network situation will be described. In the present embodiment, the upper limit value of the parameter to be set is adjusted based on the line state of the network connecting the server device and the client device. As will be described later, the parameter whose upper limit value is adjusted here is a data compression rate.

  FIG. 4B is a diagram showing the relationship between the line transmission rate and the compression parameter. In general, the bandwidth allocated is determined by the line transmission rate, and the upper limit of the data compression rate is determined by the size of the allocated bandwidth. In other words, the relationship between the line transmission rate and the compression parameter is proportional. For example, when the line transmission rate is 10 Mbps and 3 Mbps, the allocated bandwidth is different and the upper limit of the data compression rate is different. Therefore, even if the setting value 5 of the motion highest priority setting is specified, the data compression rate corresponding to the setting value 5 Are different, and the number of frames calculated accordingly is different. The number of frames when the line transmission rate is 10 Mbps is α, and the number of frames is β when the line transmission rate is 3 Mbps.

  Specifically, processing is performed according to the flow shown in FIG. First, the power is turned on (step S301), the activation of the application is detected (step S302), and the transmission rate is detected by the transmission rate detection means 202 (step S303). Then, the compression parameter setting unit 204 sets the acquired compression parameter in the image data compression unit 206 (step S304).

  Next, at a predetermined timing (step S305 / YES), the transmission rate detecting means 202 detects the transmission rate (step S306). The compression parameter setting unit 204 obtains a difference between the detected transmission rate and the transmission rate used for the setting, and when the difference is equal to or larger than a predetermined threshold (step S307 / YES), the compression parameter according to the detected transmission rate. Is set (step S308).

  Except for the timing of the compression parameter adjustment process according to the change in the transmission rate (step S305 / NO), the compression parameter is adjusted according to the change in the active window. That is, when the active window monitoring unit 203 detects a change in the active window (step S310 / YES), the application setting unit 204 sets a compression parameter optimal for the active window after the change (step S311). This step S311 is processing corresponding to step S107 and step S103 to step S104 of FIG. 6 described above.

  Next, a method for assigning bandwidth to the active window will be described. In this embodiment, the active window and the inactive window can be separated and compressed separately, and the bandwidth ratio assigned to the active window and the inactive window is varied by weighting the bandwidth allocation to the active window. Can be.

  FIG. 10 is a diagram for explaining the bandwidth allocation method. The bandwidth that can be secured by all the applications in use is determined by the line state. Usually, the bandwidth allocated to each application is determined according to the window size of each application. That is, in the table of FIG. 10 (an example of the allocated bandwidth ratio to the active window), the allocated bandwidth ratio when n = 1 is normal, and the ratio of the window size to the screen area becomes the allocated bandwidth ratio as it is. For example, when the active window is an application for browsing video, there may be a case where it is desired to allocate more bandwidth even if the bandwidth allocated to other inactive window applications is reduced.

In order to respond to such needs, in the present embodiment, the active window is weighted so that more bands can be allocated as compared with other inactive windows. Specifically, as shown in FIG. 10, the allocated bandwidth ratio is determined by the following equation using the active window area ratio with respect to the display screen and the weighting with respect to the inactive window.
Ratio of bandwidth allocated to active window = xn / (xn + (1-x))
(Active window area ratio x, active window weighting coefficient n)

  For example, the weighting coefficient may be set arbitrarily for each application, such as a weighting coefficient of 4 for a video browsing application, a weighting coefficient of 3 for a game application, and a weighting of 2 for a web browser. As shown in the table of FIG. 10, the larger the weighting coefficient, the more bandwidth is allocated even when the active window area ratio is small.

  Also, as shown in FIG. 11, when setting compression parameters, active windows and other inactive windows may be set separately. That is, for the active window, the compression parameter corresponding to the application of the window is acquired from the application parameter database, and the parameter setting is performed. For the other inactive windows, the setting is performed using the standard (default) compression parameter. You may comprise as follows.

  FIG. 12 summarizes compression parameter adjustment processing and data flow in this embodiment. In the compression parameter adjustment according to the application, the image quality setting and the number of frames are set according to the screen position, size information, and application name, and the buffer amount setting is influenced by the UI input. In compression parameter update, application database information is updated based on screen movement (video change information), UI input, and active window information, and compression parameters are set based on the updated information. In the compression parameter adjustment according to the line state, the image quality setting and the number of frames are set according to the real-time transmission speed. In the band allocation to the active window, weighting is performed based on the screen position, size information, and active window, the band is allocated to the active window, and image quality setting and frame number setting are performed.

  According to the present embodiment, it is possible to automate the setting of compression parameters that have been manually switched by the user for each application to be used. In addition, since the optimum parameter value is automatically updated and held based on the usage status of the application, the user can use the application without worrying about parameter settings.

  Further, according to the present embodiment, even when a new application is added, the parameter setting is automatically optimized based on the movement of the application, and the user can use it without worrying about the setting.

  In addition, according to the present embodiment, even if the usage is different for each user even in the same application, the setting according to the usage status of the user is optimized, so that the setting according to the usage method of the user can be automated. It becomes possible.

  In addition, according to the present embodiment, band allocation using weighting is performed on the active window, so that the band allocated to other active windows can be allocated to the active window and flexible band allocation is possible. In addition, effective use of resources is realized.

  The above-described embodiment is a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiment alone, and various modifications are made without departing from the gist of the present invention. Implementation is possible.

  That is, the program executed by the server apparatus 200 in the present embodiment includes the above-described units (compression parameter setting unit 204, image data compression unit 206, active window monitoring unit 203, video change amount monitoring unit 207, UI input). The module configuration includes a monitoring unit 208, an application parameter update unit 209, a transmission rate detection unit 202, and the like, and a specific unit is realized using actual hardware. That is, when the computer (CPU) reads a program from a predetermined recording medium and executes it, the above-mentioned means are loaded onto the main storage device and generated. Each means can be realized by software as described above, but can also be realized by hardware by configuring each unit with a circuit.

  The program executed by the server apparatus 200 in the present embodiment may be configured to be stored on a computer connected to a network such as the Internet and provided by being downloaded via the network. Further, the program may be provided or distributed via a network such as the Internet.

  The program is a file in an installable or executable format, such as a floppy (registered trademark) disk, hard disk, optical disk, magneto-optical disk, CD-ROM, CD-R, DVD, nonvolatile memory card, or the like. It may be configured to be provided by being recorded on a computer-readable recording medium. Further, the program may be provided by being incorporated in advance in a ROM or the like.

  In this case, the program code itself read from the recording medium or loaded and executed through the communication line realizes the functions of the above-described embodiments. And the recording medium which recorded the program code comprises this invention.

DESCRIPTION OF SYMBOLS 100 Client apparatus 101,201 Data transmission / reception means 102 Compression data decompression means 103 Image data display means 104,210 User interface means 200 Server apparatus 202 Transmission speed detection means 203 Active window monitoring means 204 Compression parameter setting means 205 Application parameter storage means 206 Image Data compression means 207 Video change amount monitoring means 208 UI input monitoring means 209 Application parameter updating means

Claims (10)

  An information processing apparatus, wherein parameters relating to data compression are set according to an application being used in an information processing apparatus to which compressed data is transferred. Application detecting means for detecting an application in use in the information processing apparatus to which the compressed data is transferred;
Parameter information holding means for holding the parameters related to data compression and application information in association with each other;
A parameter setting unit that reads out a parameter corresponding to the information of the application in use detected by the application detection unit from the parameter information holding unit and sets it as a parameter used for data compression;
An information processing apparatus comprising: The application information includes information on the usage status of the application,
Usage information acquisition means for acquiring information on an actual usage status of the application in use detected by the application detection means;
Corresponding to the application in use held in the parameter information holding unit based on the information on the actual usage state acquired by the usage information acquisition unit and the information on the usage state held by the parameter information holding unit Parameter updating means for updating parameters to be
The information processing apparatus according to claim 2, further comprising:   The information processing apparatus according to claim 2, wherein the parameter setting unit sets a compression rate as a parameter used for data compression based on a detection result by the application detection unit.   5. The information processing apparatus according to claim 2, wherein the parameter setting unit sets a buffer amount as a parameter used for data compression based on a detection result by the application detection unit. Having line information acquisition means for acquiring information about the line status of the connected network;
6. The parameter setting unit sets an upper limit value of a compression rate as a parameter used for data compression based on the information on the line status acquired by the line information acquisition unit. The information processing apparatus according to claim 1.   6. The information processing apparatus according to claim 2, further comprising: a bandwidth allocation unit that allocates a bandwidth according to weighting to the application in use detected by the application detection unit. An application detection step of detecting an application in use in the information processing apparatus to which the compressed data is transferred;
A parameter setting step of reading out a parameter corresponding to the information on the application in use detected by the application detection unit from a storage unit that stores a parameter relating to data compression and application information in association with each other, and setting the parameter as a parameter used for data compression When,
A parameter setting method for an information processing apparatus, comprising: On the computer,
An application detection process for detecting an application in use in the information processing apparatus to which the compressed data is transferred;
A parameter setting process for reading out a parameter corresponding to the information on the application in use detected by the application detection process from a storage unit that associates and stores a parameter relating to data compression and application information, and sets the parameter as a parameter used for data compression When,
A program characterized by having executed.   A recording medium that records the program according to claim 9 and is readable by a computer.

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