JP2011138181A - Link information output device and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce unnecessary prefetch by prefetching information of a link that is likely to be designated by a pointer, in a link information output device for outputting information of the link described on an information display screen such as a Web page. <P>SOLUTION: A link information output device calculates a range Hm (=HXm×HYm) of destination of a pointer P(px, py) according to the moving state (for example, moving direction R and moving speed (Vx, Vy)) of the pointer P on display screen data 14a(G). Then, the calculated range of the pointer destination is set as a prefetch retrieval range Hm. The Web pages HPa, HPb, HPc and HPd of the links La, Lb, Lc and Ld existing in the prefetch retrieval range Hm are prefetched, and stored in a prefetch link destination page memory 14e. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a link information output apparatus for outputting link destination information described on an information display screen such as a Web page, and a control program therefor.

  For example, in a terminal device on a communication network such as the Internet, a desired Web page can be acquired from various sites on the network and displayed.

  Then, a link is set on the Web page that allows you to jump to other pages that contain more detailed information or related information by simply clicking the main item listed on the page. Has been.

  Normally, when a link in a displayed page is clicked, a URL registered in association with the link is accessed, and a linked Web page is acquired and displayed.

  For this reason, it takes a waiting time mainly for the time required for communication from when a link in the page is clicked until the linked Web page is acquired and displayed, and the response is poor.

  Therefore, based on the relative distance between the pointer that is arbitrarily moved and displayed on the page and the link set on the page, for example, all links within a certain relative distance range from the pointer are extracted, The Web page of each link destination is prefetched in advance and stored in the memory. When an arbitrary link is clicked with a pointer and the Web page of the link destination is pre-read and saved, the pre-read Web page is immediately read from the memory and displayed so that the responsiveness can be obtained. The content prefetching device which improved is considered (for example, refer patent document 1).

JP 2004-021769 A

  In the conventional content prefetching device, the corresponding link is extracted based on the relative distance between the pointer and the link, and the web page of the link destination is prefetched and stored in advance.

  For this reason, regardless of the direction in which the pointer moves next in response to a user operation, information on all link destinations within a certain range around the pointer is pre-read and stored, which increases the waste of pre-reading. There is.

  The present invention has been made in view of the above problems, and a link information output apparatus and its control capable of prefetching link destination information with a high probability specified by a pointer and reducing prefetch waste. The purpose is to provide a program.

  The link information output device according to claim 1 is based on pointer position acquisition means for acquiring position information of a pointer that designates a position on the display screen, and on the position information of the pointer acquired by the pointer position acquisition means. A moving range calculating means for obtaining a predicted moving range of the pointer according to the direction in which the pointer moves, and a link existing in the display screen corresponding to the moving range of the pointer obtained by the moving range calculating means. A link extracting unit for extracting, a link destination information reading unit for reading link destination information corresponding to the link extracted by the link extracting unit, and a link for storing the link destination information read by the link destination information reading unit Specify the destination information storage means and the output of the link destination information stored by the link destination information storage means. When it was, and comprising: the link destination information output means for outputting to the display screen by reading the information of the link destination, the.

  The link information output device according to claim 2 is the link information output device according to claim 1, wherein terminal event receiving means for receiving an event transmitted from the thin client terminal, and display screen information to the thin client terminal Terminal position transmitting means for acquiring pointer position information for specifying a position on the display screen of the thin client terminal by the terminal event receiving means, and outputting the link destination information When the event received by the terminal event receiving unit is an event designating the output of the link destination information stored by the link destination information storage unit, the means reads the link destination information, and the terminal screen The thin client terminal as display screen information of the thin client terminal by the transmission means Transmitted to, it is characterized by.

  The link information output device according to claim 3 is the link information output device according to claim 1 or 2, wherein the pointer has moved based on the position information of the pointer acquired by the pointer position acquisition means. Pointer movement determination means for determining whether or not the movement range calculation means has pointer movement speed calculation means for obtaining the movement speed of the pointer when the pointer movement determination means determines that the pointer has moved. Then, the movement range of the pointer predicted according to the direction in which the pointer moves and the movement speed of the pointer obtained by the movement speed calculation means is obtained.

  The program according to claim 4 is a program for controlling a computer of an electronic device having a drawing area for display screen information, and obtains position information of a pointer for designating a position on the display screen. A pointer position acquisition unit, a movement range calculation unit that obtains a predicted movement range of the pointer according to the direction in which the pointer moves based on the pointer position information acquired by the pointer position acquisition unit, and the movement range calculation unit Link extraction means for extracting a link existing in the display screen corresponding to the determined pointer movement range, and link destination information reading means for reading link destination information corresponding to the link extracted by the link extraction means The link destination information read by the link destination information reading means is stored in the memory. Link destination information storage means for storing, and a link for reading the link destination information and outputting it to the display area of the display screen information when the output of the link destination information stored by the link destination information storage means is designated It is characterized by functioning as a prior information output means.

  ADVANTAGE OF THE INVENTION According to this invention, the link information output device which can prefetch the information of a link destination with high probability designated with a pointer, and can reduce the waste of prefetching and its control program can be provided.

The block diagram which shows the structure of the SBC (Server Based Computing) system which concerns on embodiment of the link information output device of this invention. The block diagram which shows the circuit structure of the server apparatus 10 in the said SBC system. The image figure explaining the link destination information prefetch function performed based on the position detection signal of the pointer P from the client apparatus 20 in the server apparatus 10 of the SBC system. The flowchart which shows the link destination information prefetch process by the server apparatus 10 of the said SBC system. The figure explaining the prefetch search range Hm of the link destination calculated according to the moving direction R and the moving speed (Vx, Vy) of the pointer P with the link destination information prefetching process by the server device 10. The flowchart which shows the link destination information display process by the server apparatus 10 of the SBC system. The figure explaining the prefetch search range H 'of other embodiment calculated according to the moving direction R and the moving speed (Vx, Vy) of the pointer P with the link destination information prefetching process by the said server apparatus 10. FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of an SBC (Server Based Computing) system according to an embodiment of a link information output apparatus of the present invention.

  This SBC system includes a server device 10 and a plurality of client devices (Thin clients) 20 connected to a network N composed of a LAN (Local Area Network) or a WAN (Wide Area Network).

  The server device 10 has a plurality of application programs such as an Internet connection processing program, a Web browser program, a mail processing program, a document creation processing program, a spreadsheet processing program, and a presentation material creation program, and is connected to the server device 10. An application program is started in accordance with an operation input (input event) signal from the client device 20,.

  In the server device 10, the display output drawing data G generated on the client frame buffer RAM 14a (see FIG. 2) in accordance with the execution of the application program according to the operation input signal from the client device 20,. After being compressed, it is transmitted (transferred) to the client device 20 of the access source.

  In the client devices 20,..., The drawing data G transferred from the server device 10 is decompressed and displayed on the display screen.

  That is, each client device (Thin client) 20,... In this SBC system has an input function corresponding to a user operation such as a keyboard and a mouse and an output function to an LCD display unit and a printer as main functions. The server device 10 does not have at least various application functions and data file management functions.

  And the data file produced | generated with the various processes started and performed in the server apparatus 10 according to the operation input (input event) signal from the client apparatus 20 ... is fundamentally in the said server apparatus 10. Alternatively, it is stored and stored for each user account or as a shared file in a storage device such as a magnetic disk managed and managed by the server device 10.

  FIG. 2 is a block diagram showing a circuit configuration of the server device 10 in the SBC system.

  FIG. 3 is an image diagram for explaining a link destination information prefetching function executed based on the position detection signal of the pointer P from the client device 20 in the server device 10 of the SBC system.

  The server device 10 includes a CPU 11 as a computer, and a ROM 13, a RAM 14, a frame buffer RAM 15, and a display device 16 are connected to the CPU 11 via a bus 12.

  Further, a communication I / F (interface) 19 with an input device 17 such as a keyboard and a mouse, an external storage device 18, a client device 20,.

  The CPU 11 controls the operation of each part of the circuit using the RAM 14 as a working memory in accordance with a server control program including a system program and various application programs stored in advance in the program memory 13a in the ROM 13. The various programs are started and executed in accordance with an input signal or an input event signal corresponding to a user operation from the client device 20 received via the communication I / F 19.

  In this server device 10, various data generated in accordance with an application program activated / executed in response to an input event signal from the client device 20 is stored in the external storage device 18 in association with the user ID, for example. . The drawing data G for client display is generated using the client frame buffer RAM 14 a in the RAM 14, and after being compressed, is transferred from the communication I / F 19 to the client device 20 for display output.

  Further, the server device 10 includes a pointer coordinate memory 14b, a prefetch search range memory 14c, a prefetch link destination memory 14d, a prefetch link destination page memory 14e, and the like managed for each client device 20 (user ID). Have.

  In the pointer coordinate memory 14b, when the input event signal from the client device 20 is a position detection signal on the display screen of the pointer P (see FIG. 3) received every predetermined time (for example, 300 ms). The coordinates (px, py) of the pointer P whose position has been detected are stored in association with the reception time.

  The look-ahead search range memory 14c stores the direction R, velocity (Vx, Vy), constant a based on the change (ΔX, ΔY) of the coordinates (px, py) of the pointer P stored in the pointer coordinate memory 14b. , b, and c, the predicted movement range HXm × HYm of the pointer P is stored as a range (prefetch search range) Hm (see FIG. 3) for prefetching and searching for link destination information.

  In the prefetch link destination memory 14d, link destinations of links La, Lb, Lc, Ld (see FIG. 3) existing in the Web page area corresponding to the prefetch search range Hm stored in the prefetch search range memory 14c. The URL is stored.

  The prefetch link destination page memory 14e stores data of link destination Web pages HPa, HPb, HPc, and HPd (see FIG. 3) acquired according to the link destination URL stored in the prefetch link destination memory 14d.

  Note that drawing data to be displayed on the display device 16 of the server device 10 itself is generated on the frame buffer RAM 15.

  Next, the operation of the SBC system configured as described above will be described.

  First, a basic operation between the client device 20 and the server device 10 according to a user operation of the client device 20 will be described.

  When a connection request is transmitted from the client device 20 to the server device 10 along with the startup of the client device 20, the server device 10 executes an authentication process for the client device 20 and establishes a connection with the client device 20. The

  Then, when an input event signal corresponding to a user operation of the client device 20 is transmitted to the server device 10, an application program is executed according to the contents of the input event received by the server device 10, and a frame buffer for the client Display screen data G is generated on the RAM 14a.

  The client display screen data G is transferred to the client device 20 and displayed on the display device, and the user can view an operation screen corresponding to the user's own operation content.

  For example, in the client device 20, when an input event signal requesting acquisition of a user-specified Web page is transmitted to the server device 10, the server device 10 starts a Web browser, acquires the user-specified Web page, and displays its display screen. Data G is generated. Then, the display screen data G of this Web page is transferred to the client device 20 and displayed.

  FIG. 4 is a flowchart showing link destination information prefetching processing by the server device 10 of the SBC system.

  FIG. 5 is a diagram for explaining the link destination prefetch search range Hm calculated according to the movement direction R and the movement speed (Vx, Vy) of the pointer P in accordance with the link destination information prefetch processing by the server device 10.

  In the state where the display screen data G of the Web page acquired in the server device 10 is transferred to the client device 20 and displayed, the coordinate data (Xcur, Xcur,) of the pointer P that is operated and moved on the display screen of the client device 10 is displayed. Ycur) is detected every predetermined time t (for example, 300 ms) and transmitted to the server device 10 as an input event signal.

  When the server device 10 receives the coordinate data (Xcur, Ycur) of the pointer P transmitted from the client device 20 every predetermined time t, the received coordinate data (Xcur, Ycur) of the pointer P is It is associated with the reception time and stored in the pointer coordinate memory 14b (step S1).

  Then, the difference (ΔX = Xcur−Xpre, ΔY =) between the coordinate data (Xcur, Ycur) of the currently received pointer P stored in the pointer coordinate memory 14b and the coordinate data (Xpre, Ypre) of the previously received pointer P is stored. Ycur-Ypre) [movement amount of the pointer P] is calculated (step S2), and it is determined whether or not the movement amounts ΔX and ΔY of the pointer P are both “0”, that is, whether or not the pointer P has moved. (Step S3).

  If it is determined that the movement amounts ΔX and ΔY of the pointer P are not “0” and the pointer P has moved (step S3 (No)), the movement amounts ΔX and ΔY of the pointer P and the movement time t are determined. Based on (= 300 ms), as shown in FIG. 5A, the moving direction R of the current pointer P (px, py), the moving speed Vx (= ΔX / 300 (ms)), Vy (= ΔY / 300 ms ) Is obtained (step S4).

  On the other hand, when the movement amounts ΔX and ΔY of the pointer P are both “0” and it is determined that the pointer P has not moved (step S3 (Yes)), the movement speed of the current pointer P (px, py). Vx = 0 and Vy = 0 are set (step S9).

  Then, based on the coordinates (Xcur, Ycur) of the current pointer P, the moving speed (Vx, Vy), and constants a, b, c, the predicted moving range HXm of the pointer P on the client display screen data G XHYm is calculated according to the following equations (1a) (1b) and the following equations (2a) (2b) (step S5).

  The predicted movement range HXm × HYm of the pointer P is a range (prefetch search range) Hm for prefetching and searching for link destination information.

Upper left coordinates (Xlu, Ylu) of prefetch search range Hm:
Xlu = Xcur + (a + b / 2) Vx + c ... Formula (1a)
Ylu = Ycur + (ab / 2) Vy-c (1b)
Lower right coordinates (Xrd, Yrd) of prefetch search range Hm:
Xrd = Xcur + (ab / 2) Vx-c ... Formula (2a)
Yrd = Ycur + (a + b / 2) Vy + c ... Formula (2b)
The constant a is set according to the moving distance in the moving direction R from the current pointer P (px, py).

  The constant b is set according to the movement range of prediction in the X direction and the Y direction around the pointer P (px + aVx, py + aVy) after movement.

  The constant c is set to the smaller one of the vertical and horizontal links existing in the client display screen data G.

  That is, as shown in FIG. 5A, the prefetch search range Hm when the pointer P is moving is HXm (= bVx +) centered on the pointer P (px + aVx, py + aVy) after movement. 2c) × HYm (= bVy + 2c) and stored in the prefetch search range memory 14c.

  Further, the prefetch search range Hm when the pointer P is stopped is a 2c × 2c range centered on the current pointer P (px, py) as shown in FIG. 14c.

  Thus, when the prefetch search range Hm in which the pointer P is moving or stopped on the client display screen data G is obtained, a link exists in the area of the Web page corresponding to the prefetch search range Hm. Is determined (step S6).

  If it is determined that a link exists in the prefetch search range Hm (step S6 (Yes)), the link destination URL (link information) of the link is acquired and stored in the prefetch link destination memory 14d. It is determined whether or not (step S7).

  If it is determined that the link destination URL of the link existing in the prefetch search range Hm is not stored in the prefetch link destination memory 14d (No in step S7), the link destination URL is stored in the prefetch link destination memory 14d. In addition to being stored, the link destination URL is accessed and the link destination Web page HP is read and stored in the prefetch link destination page memory 14e (step S8).

  On the other hand, when it is determined that no link exists in the prefetch search range Hm (step S6 (No)), or the link destination URL of the link existing in the prefetch search range Hm is already stored in the prefetch link destination memory 14d. If it is determined that the link destination page is read (step S7 (Yes)), the linked page reading process (S8) is not executed, and the coordinate data (Xcur, Ycur) of the pointer P transmitted next from the client device 20 is not executed. ) Is in a reception standby state (RETURN → step S1).

  As described above, in the link destination information prefetching process, the range of the movement destination of the pointer P is calculated according to the movement state of the pointer P on the display screen data G in the client device 20. Then, the calculated pointer movement destination range is set as a prefetch search range Hm, and the linked web page HP existing in the prefetch search range Hm is prefetched and stored in the prefetch link destination page memory 14e.

  Therefore, in the server device 10, as will be described in the next link destination information display process (see FIG. 6), the input event received from the client device 20 specifies a link existing in the prefetch search range Hm. If the event is an event, it is not necessary to execute the access to the link destination and the Web page HP acquisition process at that time. The Web page HP can be immediately transferred to the client device 20 as the client display screen data G.

  FIG. 6 is a flowchart showing link destination information display processing by the server device 10 of the SBC system.

  In the server device 10, the content of the input event signal received from the client device 20 is a click event that designates a link in the Web page HP that is currently transferred and displayed as the client display screen data G. It is determined whether or not there is (step T1).

  Here, if it is determined that the content of the input event signal received from the client device 20 is a click event that designates a link in the Web page HP being displayed (step T1 (Yes)), the designated link. Whether or not the data of the previous Web page HP is prefetched and stored in the prefetch link destination page memory 14e is determined according to whether or not the link destination URL is stored in the prefetch link destination memory 14d (step T2). ).

  Here, when it is determined that the designated link destination URL is stored in the prefetch link destination memory 14d and the data of the Web page HP is prefetched and stored in the prefetch link destination page memory 14e (step). T2 (Yes)), the data of the linked Web page HP is rendered as display screen data G in the client frame buffer RAM 14a (step T3), transferred to the event input source client device 20, and displayed. (Step T5).

  Then, the data of the link destination Web page HP and the link destination URL transferred to the client device 20 in Step T5 are deleted from the prefetch link destination page memory 14e and the prefetch link destination memory 14d, respectively (Step T6). .

  On the other hand, if it is determined in step T2 that the designated link destination URL is not stored in the prefetch link destination memory 14d and the data of the Web page HP is not stored in the prefetch link destination page memory 14e ( In step T2 (No), the link destination web page HP is accessed by accessing the link destination URL, and is rendered as display screen data G in the client frame buffer RAM 14a (step T4). Then, it is transferred to the event input source client device 20 and displayed (step T5).

  In this embodiment, the link destination URL stored in the prefetch link destination memory 14d and the prefetch link destination page memory 14e and the data of the link destination web page HP are the link destination from the client device 20. Is deleted upon transfer as display screen data G to the client apparatus 20 in accordance with the designation. On the other hand, when the data amount of the Web page stored in the prefetch link destination page memory 14e exceeds a predetermined amount, the transmitted Web page data may be deleted.

  Therefore, according to the link destination information prefetch function and the link destination information display function by the server device 10 of the SBC system having the above-described configuration, the input event received from the client device 20 designates a link existing in the calculated prefetch search range Hm. If it is an event to be performed, access to the link destination and acquisition processing of the Web page HP do not need to be executed at that time, and the designated link destination prefetched and stored in the prefetch link destination page memory 14e Can be immediately transferred to the client apparatus 20 as the client display screen data G. In addition, according to the movement state of the pointer P in the client device 20, it is possible to reduce the waste of prefetching by prefetching only the link destination information that has a high probability of being designated thereafter.

  In the server device 10 of the above-described embodiment, the movement range (prefetch search range) Hm of the pointer P on the display screen data G in the client device 20 is changed to the current pointer P coordinates (Xcur, Ycur) and movement. Based on the speed (Vx, Vy) and the constants a, b, c, it is configured only within the prefetch search range Hm calculated according to the above formulas (1a), (1b) and (2a), (2b).

  On the other hand, as shown in FIG. 7, another prefetch search range H ′ including the prefetch search range Hm of the embodiment may be set.

  FIG. 7 is a diagram for explaining a prefetch search range H ′ of another embodiment calculated according to the moving direction R and the moving speed (Vx, Vy) of the pointer P in accordance with the link destination information prefetching process by the server device 10. It is.

  That is, in this other embodiment, the upper left coordinates (Xlup, Ylup) and the lower right coordinates (Xrdp) of the prefetch search range Hp (= 2c × 2c) corresponding to only the coordinates (px, py) of the current pointer P. , Yrdp) and the upper left coordinates (Xlu, Ylu) and lower right coordinates (Xrd, Yrd) of the prefetch search range Hm (= (bVx + 2c) × bVy + 2c)) calculated by the method of the above embodiment Is set as a new prefetch search range H ′.

  According to this, it becomes possible to prefetch the linked web page HP existing in the wider prefetch search range H ′ corresponding to the moving direction R and the moving speed (Vx, Vy) of the pointer P. While reducing waste of prefetching, it is possible to prefetch information on a link destination with a high probability of being designated in a wider range.

  That is, in each of the above embodiments, the prefetch search range Hm (H ′) of the link destination on the display screen data G is calculated according to the moving direction R and moving speed (Vx, Vy) of the pointer P. .

  Note that each processing method by the server device 10 of the SBC system described in each of the above embodiments, that is, the link destination information prefetching process shown in the flowchart of FIG. 4, the link destination information display process shown in the flowchart of FIG. Each method such as the calculation processing of the prefetch search range Hm ′ according to another embodiment associated with the link destination information prefetch processing shown in the flowchart is a memory card (ROM card, RAM card) that can be executed by a computer. Etc.), magnetic disk (floppy disk, hard disk, etc.), optical disk (CD-ROM, DVD, etc.), semiconductor memory, etc. Then, the computer (CPU 11) of the server device 10 reads the program stored in the medium of the external recording device 18 into the storage device (flash ROM 13 or RAM 14), and the operation is controlled by the read program, so that The link destination information prefetching function and its display function described in each embodiment can be realized, and the same processing as described above can be executed.

  Further, program data for realizing each of the above methods can be transmitted on the communication network (N) in the form of a program code, and from a computer device (program server) connected to the communication network (N). The program data is fetched and stored in a storage device (flash ROM 13 or RAM 14), and the above-described prefetch function of link destination information and its display function can be realized.

  Note that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention at the stage of implementation. Further, each of the embodiments includes inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in each embodiment or some constituent elements are combined in different forms, the problems described in the column of the problem to be solved by the invention If the effects described in the column “Effects of the Invention” can be obtained, a configuration in which these constituent requirements are deleted or combined can be extracted as an invention.

DESCRIPTION OF SYMBOLS 10 ... Server apparatus 20 ... Client apparatus 11 ... CPU
12 ... Bus 13 ... ROM
13a ... Program memory 14 ... RAM
14a: Client frame buffer RAM
14b ... Pointer coordinate memory 14c ... Prefetch search range memory 14d ... Prefetch link destination memory 14e ... Prefetch link destination page memory 15 ... Frame buffer RAM
16 ... Display device 17 ... Input device 18 ... External storage device 19 ... Communication I / F
N ... Communication network G ... Display screen data for clients

Claims (4)

Pointer position acquisition means for acquiring position information of a pointer for specifying a position on the display screen;
Based on the pointer position information acquired by the pointer position acquisition means, a movement range calculation means for obtaining a predicted movement range of the pointer according to the direction in which the pointer moves;
Link extraction means for extracting links existing in the display screen corresponding to the movement range of the pointer obtained by the movement range calculation means;
Link destination information reading means for reading link destination information corresponding to the link extracted by the link extraction means;
Link destination information storage means for storing link destination information read by the link destination information reading means;
Link destination information output means for reading out the link destination information and outputting it to the display screen when the output of the link destination information stored by the link destination information storage means is designated;
A link information output device comprising: Terminal event reception means for receiving an event transmitted from a thin client terminal;
Terminal screen transmission means for transmitting display screen information to the thin client terminal,
The pointer position acquisition means acquires position information of a pointer that designates a position on the display screen of the thin client terminal by the terminal event reception means,
The link destination information output means, when the event received by the terminal event reception means is an event designating output of link destination information stored by the link destination information storage means, Read, and transmit to the thin client terminal as display screen information of the thin client terminal by the terminal screen transmission means,
The link information output device according to claim 1. Based on pointer position information acquired by the pointer position acquisition means, comprising pointer movement determination means for determining whether or not the pointer has moved,
The movement range calculation means includes pointer movement speed calculation means for obtaining a movement speed of the pointer when the pointer movement determination means determines that the pointer has moved, and the direction in which the pointer moves and the movement speed calculation means Obtaining a movement range of the pointer predicted according to the movement speed of the pointer obtained by
The link information output device according to claim 1 or 2, characterized in that A program for controlling a computer of an electronic device having a drawing area for display screen information,
The computer,
Pointer position acquisition means for acquiring position information of a pointer for specifying a position on the display screen;
Based on the pointer position information acquired by the pointer position acquisition means, a movement range calculation means for obtaining a predicted movement range of the pointer according to the direction in which the pointer moves,
Link extraction means for extracting links existing in the display screen corresponding to the movement range of the pointer obtained by the movement range calculation means;
Link destination information reading means for reading link destination information corresponding to the link extracted by the link extraction means;
Link destination information storage means for storing link destination information read by the link destination information reading means in a memory;
Link destination information output means for reading the link destination information and outputting it to the display area of the display screen information when the output of the link destination information stored by the link destination information storage means is designated,
Program to function as.

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