Abstract:
A technology provides a function capable of passively utilizing a multiplicity of contents on networks. An information processing system includes a storage unit storing information, and a control unit. The control unit searches locating information for locating where data exists, and judges whether or not the data located by the locating information comes under a predetermined category. When the data is judged to come under the predetermined category, the storage unit stores the locating information and collects pieces of locating information for locating where the data exist.

Description:
BACKGROUND OF THE INVENTION 
   The present invention relates to an information processing system and an information collecting method of collecting pieces of information related to contents on a network, and also to a computer program. 
   With developments of computers and communication technologies, users become able to access a variety of resources in a network such as the Internet etc. The contents in a variety of categories such as animated images (motion pictures), sounds (including music data and vocal sounds), still images (still pictures), character data and soon, are provided on the network. 
   Further, a majority of terminal devices come to connect to the network at all times owing to a reduction in communication charges. Under such an environment, there arises a desire for utilizing the contents on the network as by the conventional TV and radio. This is because the animated images and sounds on the network contain the same categories of contents as those provided by TV programs and radio programs. 
   The TV and radio, however, upon switch-on and predetermined settings, provide the contents in accordance with a program schedule without any active operation of a user. While on the other hand, the user, when accessing the contents on the network, needs the active operation. 
   Namely, the user, before utilizing the contents on the network, must trace the information on the network by an interactive operation. Therefore, even though the computers and networks have widely spread, the user is unable to simply passively utilize the contents on the network as by the TV and radio. 
   SUMMARY OF THE INVENTION 
   It is a primary object of the present invention, which was devised to obviate the problems inherent in the prior art, to provide a function capable of simply passively utilizing a multiplicity of contents on a network. 
   To accomplish the above object, according to a first aspect of the present invention, an information processing system ( 1 ,  11 ) comprises a storage unit ( 3 ,  4 ,  13 ,  14 ) for storing information, and a control unit ( 2 ,  12 ), wherein the control unit ( 2 ,  12 ) searches locating information for locating where data exists, and judges whether or not the data located by the locating information comes under a predetermined category, and the storage unit ( 3 ,  4 ,  13 ,  14 ), when the data is judged to come under the predetermined category, stores the locating information to collect pieces of locating information for locating where the data exist. 
   Preferably, the information processing system ( 1 ,  11 ) may further comprise a communication unit ( 8 ,  18 )for accessing a network, ora communication connection module ( 8   a ,  18   a ) through which the communication unit is connected, wherein the control unit ( 2 ,  12 ) may search the locating information retained in other information processing system on the network. 
   Preferably, the communication unit ( 8 ,  18 ) may receive a selection criterion for selecting the data, and the control unit ( 2 ,  12 ) may judge whether or not the data is coincident with the selection criterion and collects pieces of locating information tracing to the data coincident with the selection criterion. 
   Preferably, the information processing system ( 1 ,  11 ) may further comprise an input unit, wherein the input unit may receive an input of the selection criterion for selecting the data, and the control unit may judge whether or not the data is coincident with the selection criterion and collect pieces of locating information tracing to the data coincident with the selection criterion. 
   Preferably, the communication unit ( 18 ) may receive a request for collecting the locating information from a terminal device ( 1 ) connected to the network, and the control unit may get the collected locating information displayed on the terminal device ( 1 ). 
   Preferably, the information processing system ( 1 ,  11 ) may further comprise a display unit ( 5 ,  15 )for displaying the information, or a first connection module ( 5   a ,  15   a ) through which the display unit is connected, wherein the control unit ( 2 ,  12 ) may get the collected locating information displayed on the display unit ( 5 ,  15 ). 
   Preferably, the control unit ( 2 ,  12 ) may search character information related to the data, and may get the character information displayed in a way of being combined with the locating information. 
   Preferably, categories of the data may be still image data, sound data, animated image data, text data, or combinations thereof. Herein, the sound data contain music data, vocal sounds and other kind of sounds. 
   Preferably, the information processing system ( 1 , 11 ) may further comprise an input unit ( 6 ,  7 ,  17 ,  17 ), a display unit ( 5 ,  15 ) for displaying information, or a first connection module ( 5   a ,  15   a ) through which the display unit ( 5 ,  15 ) is connected, and a sound output unit ( 9   b  and  9   c ) for outputting sounds, or a second connection module ( 9   a ) through which the sound output unit ( 9   b  and  9   c ) is connected, wherein the input unit ( 6 ,  7 ,  16 ,  17 ) is commanded to output the data, and the control unit ( 2 ,  12 ) may get the content described by the data outputted. Herein, the outputting of the content implies reproducing the animated images and the sounds (containing the music data, vocal sounds and other kind of sounds) and displaying the still images and the text information. 
   According to a second aspect of the present invention, a terminal device ( 1 ) comprises a communication unit ( 8 ) for accessing a network, or a communication connection module ( 8   a ) through which the communication unit is connected, and a control unit ( 2 ), wherein the control unit ( 8 ) requests a server ( 11 ) on the network to collect pieces of locating information for locating where data exist, the data located by the locating information coming under a predetermined category, thus collecting the locating information. 
   Preferably, the terminal device ( 1 ) may further comprise a display unit ( 5 ) for displaying the information, or a first connection module ( 5   a ) through which the display unit is connected, wherein the control unit ( 2 ) may get the collected locating information displayed on the display unit ( 5 ). 
   Preferably, the terminal device ( 1 ) may further comprise an input unit ( 6 ,  7 ), a display unit ( 5 ) for displaying information, or a first connection module ( 5   a ) through which the display unit is connected, and a sound output unit ( 9   b ,  9   c ) for outputting sounds, or a second connection module ( 9   a ) through which the sound output unit ( 9   b ,  9   c ) is connected, wherein the input unit ( 6 ,  7 ) may be commanded to output the data, and the control unit ( 2 ) may get the content described by the data outputted to the display unit or the sound output unit. 
   The control unit may get a plurality of contents consecutively outputted, which are located by plural pieces of locating information collected. 
   According to a third aspect of the present invention, a system comprises a search unit ( 2 ) for searching content data corresponding to predetermined conditions, a sequence determining unit ( 2 ) for determining a sequence of reproducing the content data searched, and a reproduction control unit ( 2 ) for controlling the reproduction of the content data in accordance with the reproducing sequence. 
   Preferably, the content data may be retained in other system accessible via a network. 
   Preferably, the predetermined condition may be specified by a user. 
   Preferably, the predetermined condition may be to specify a specific genre of the content. 
   Preferably, the predetermined condition may be to specify a specific data category. 
   Preferably, the content data may be stream data. 
   According to a fourth aspect of the present invention, a method of collecting locating information for indicating a location of data, comprises a step (S 31 , S 32 ) of searching locating information for locating where data exists, a step(S 34 )of judging whether or not the data comes under a predetermined category, and a step (S 36 ) of storing, when judging that the data comes under the predetermined category, the locating information. 
   According to a fifth aspect of the present invention, a method comprises a step (S 31 -S 35 ) of searching content data coincident with a predetermined condition, a step (S 36 ) of determining a sequence of reproducing the content data searched, and a step (S 100 -S 111 ) of controlling the reproduction of the content data in accordance with the reproducing sequence. According to a sixth aspect of the present invention, there is provided a readable-by-computer recording medium recorded with a program executed by a computer to actualize any one of the functions described above. 
   As explained above, according to the present invention, a multiplicity of contents on the network can be simply passively utilized. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a diagram showing an outline of system architecture of an information search system in a first embodiment; 
       FIG. 2  is a diagram showing a hardware architecture of a PC  1 ; 
       FIG. 3  is a diagram showing a hardware architecture of a management server  11 ; 
       FIG. 4  is a diagram showing an example of an EPG creation request; 
       FIG. 5  is a diagram showing an example of an EPG display screen on the PC  1 ; 
       FIG. 6  is a diagram showing an example of a data structure of an orientation database  21 ; 
       FIG. 7  is a diagram showing an example of a data structure of a content judgement table; 
       FIG. 8  is a flowchart showing processes of an EPG creation program in the first embodiment; 
       FIG. 9  is a flowchart showing details of a URL search process; 
       FIG. 10  is a flowchart showing a content auto reproduction process based on a relative time; 
       FIG. 11  is a flowchart showing the content auto reproduction process synchronizing with a real time; 
       FIG. 12  is a diagram showing an outline of system architecture of the information search system in a second embodiment; and 
       FIG. 13  is a flowchart showing processes of the EPG creation program in the second embodiment. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   Preferred Embodiments of the present invention will hereinafter be described with reference to the accompanying drawings. 
   First Embodiment 
   A first embodiment of the present invention will hereinafter be discussed referring to  FIGS. 1 through 11 .  FIG. 1  is a diagram showing an outline of a system architecture of an information search system in the first embodiment.  FIG. 2  is a diagram showing a hardware architecture of a personal computer  1  (which will hereinafter abbreviated to PC  1 ) defined as a client.  FIG. 3  is a diagram showing a hardware architecture of a management server  11  shown in  FIG. 1 .  FIG. 4  shows an example of an EPG (Electronic Program Guide) creation request screen  31  on the PC  1 .  FIG. 5  shows an example of an EPG display screen  32  on the PC  1 .  FIG. 6  shows an example of data structure of an orientation database  21  shown in  FIG. 1 .  FIG. 7  shows an example of data structure of a content judgement table to which the management server  11  refers.  FIG. 8  is a flowchart showing processes of an EPG creation program executed by the management server  1  shown in  FIG. 1 .  FIG. 9  is a flowchart showing details of an URL search process shown in  FIG. 8 .  FIG. 10  is a flowchart showing a content auto reproducing process on a relative time basis.  FIG. 11  is a flowchart showing the content auto reproducing process synchronizing with a real time. 
   &lt;Outline of System Architecture&gt; 
     FIG. 1  is the diagram showing the system architecture of the information search system. This information search system is configured by content servers for providing contents, the management server  11  for creating an EPG by searching information in the self-database as well as in the content servers, and the PC  1  that accesses the management server  11  and the content serves via a network. 
   The management server  11  in this information search system searches a variety of contents existing on the computers in the Internet such as animated images (moving pictures), sounds, still images (still pictures), texts or composite data thereof, thereby automatically creating a content list. Herein, the sounds contain music data, vocal sounds and other kind of sounds (this terminology will hereinafter be applied the same as the above). 
   In the first embodiment, this content list may be defined as the EPG. The management server  11  executes the EPG creation program for creating the EPG. In this EPG creation process, the management server  11 , based on a keyword and a category specified by a user, collects the contents related to this specification, thus creating the EPG. 
   Further, the management server  11  includes the orientation database  21 , an advertisement database  22 , and an unillustrated content database. The orientation database  21  contains data indicating categories of the contents provided by the content servers and the management server  11 . The management server  11  searches the orientation database  21  and, based on this searched result, further searches the information in the content servers and the management server  11  itself. 
   The PC  1  in the present information search system executes (boots) a browser and automatically reproduces the contents on the basis of the EPG. Of these contents especially the animated images, the sounds and the composite data thereof are called stream data. A function of reproducing the stream data is actualized by a program incorporated into the browser. 
   The stream data may be defined as on-demand data, i.e., the data of such a type as to be downloaded when in the reproducing process. The browser provides, in addition to a function of consecutively reproducing the contents based on the EPG, a function of individually reproducing the EPG content specified by the user. 
   An outline of processing in the system will hereinafter be described with reference to  FIG. 1 . To start with, the client such as the PC  1  etc requests the management server  11  to create the EPG (as indicated by an arrowhead  101 ). At this time, the PC  1  transfers the category desired by the user and the keyword to the management server  11 . 
   The management server  11 , based on the orientation database  21 , searches the management server  11  itself and HTML files held by the content servers in the network (as indicated by an arrowhead  102 ). The management server  11  collects URLs (Uniform Resource Locators) for locating the contents from those HTML files. 
   Next, the management server  11  sorts out the collected URLs as a list and creates the EPG (as indicated by an arrowhead  103 ). Further, the management server  11  selects a predetermined item of advertisement data from the advertisement database  22 , and adds a URL locating this item of advertisement data to the EPG (an arrowhead  104 ). The EPG created is distributed to the PC  1  (an arrowhead  105 ). 
   The client such as the PC  1  requests the content server to distribute the content concerned in accordance with the URL described in the EPG (an arrowhead  106 ). The content server having received the request distributes that content to the client such as the PC  1  (an arrowhead  107 ). 
   &lt;Hardware Architecture&gt; 
     FIG. 2  is the diagram showing the hardware architecture of the PC  1 . The PC 1  includes a CPU  2  for executing the programs, a memory  3  for storing the programs executed by the CPU  2  and data processed by the CPU  2 , peripheral devices such as a hard disk  4  for recording the programs and the data, a display device  5  for displaying information such as menus, icons, messages etc, a keyboard  6  for inputting character data, a pointing device  7  for manipulating the menus and the icons on the display device  5 , a communication unit  8  for accessing the network and a sound output unit  9   b  for outputting the sounds to a loudspeaker  9   c , and a variety of interfaces for connecting these peripheral devices to the CPU  2 . 
   The CPU  2  executes the programs stored in the memory  3 , thereby providing a function as the client. 
   The memory  3  stores the programs executed by the CPU  2  and the data processed by the CPU  2 . 
   The hard disk  4  is recorded with the programs executed by the CPU  2  and the data processed by the CPU  2 . The hard disk  4  is connected via an I/O interface  4   a  to the CPU  2 . 
   The display device  5  displays the information, the menu, the icon and the message that are inputted by the user, the EPG distributed by the management server  11 , and the contents provided by the content servers. The display device  5  may be one of, e.g., a CRT, a liquid crystal display, a PDP (Plasma Display Panel), an EL (Electro Luminescence) panel, a FED (Field Emission Display) etc. The display device  5  is connected via a display interface  5   a  to the CPU  2 . 
   The keyboard  6  is used for inputting the character data. The keyboard  6  is connected via an input interface  6   a  to the CPU  2 . 
   The pointing device  7  is used for manipulating the menus and the icons displayed on the display device  5 . The pointing device  7  may be one of, e.g., a mouse, a trackball, a joystick, an electrostatic touch panel, a stick-shaped pointing device, an optical pointing device and a touch panel. The pointing device  7  is connected via an input interface  7   a  to the CPU  2 . 
   The communication unit  8  accesses the network in accordance with a command from the CPU  2 , and communicates with other host on the network. The communication unit  8  is connected via an I/O interface  8   a  to the CPU  2 . 
   The communication unit  8  may be one of, e.g., a LAN (Local Area Network) card, a MODEM and a dialup router. The LAN card is inserted into a slot in the PC  1 . The MODEM may be of a type of being built in the PC  1  or attached outside. 
   The sound output unit  9   b  generates analog sound waveforms from the sound data and outputs the sound waveforms to the loudspeaker  9   c . The sound output unit  9   b  is connected via an output interface  9   a  to the CPU  2 . 
     FIG. 3  is the diagram showing a hardware architecture of the management server  11 . The management server  11  includes a CPU  12  and a memory  13 . Further, peripheral devices such as a hard disk  14 , a display device  15 , a keyboard  16 , a pointing device  17  and a communication unit  18 , are connected respective interfaces to the management server  11 . 
   The hard disk  14  is connected via an I/O interface  14   a  to the CPU  12 . Further, the display device  15  is connected via a display interface  15   a  to the CPU  12 . 
   Moreover, the keyboard  16  is connected via an input interface  16   a  to the CPU  12 . The pointing device  17  is connected via an input interface  17   a  to the CPU  12 . A communication unit  18  is connected via an I/O interface  18   a  to the CPU  12 . Configurations thereof are the same as those of the PC  1 , and hence their repetitive explanations are omitted. 
   &lt;Screen Layout&gt; 
     FIG. 4  shows the EPG creation request screen  31 . The EPG creation request screen  31  is displayed on the display device  5  when the PC  1  accesses the management server  11 . The user sets predetermined items on this screen and is thereby able to restrict contents listed up in the EPG. Namely, the EPG creation request screen  31  provides a function of setting filtering conditions. 
   As shown in  FIG. 4 , on the EPG creation request screen  31 , a title “EPG world” is displayed in an uppermost area of the screen, three items of filtering conditions are displayed under the title, and a “Creation” button is displayed in a lower area of the screen. 
   Among the three items of filtering conditions, the first filtering condition is “Which category of data do you desire for?”. Options prepared for this filtering condition are “Sound”, “Animated image”, “Still image”, “Text” and “Unspecified”. 
   If the user specifies “sound”, URLs for indicating the contents containing the sounds are collected, thereby creating the EPG. Further, if the user specifies “Animated image”, the contents containing the animated images are collected. Moreover, if the user specifies “Still image”, the contents containing the still images are collected. Similarly, if the user specifies “Text”, the contents containing the texts are collected. 
   If the user selects “Unspecified”, all items of data are targets for collection. The user may specify a combination of a plurality of options excluding “Unspecified”. 
   The second filtering condition among the three filtering conditions is “What is a genre?”. Options prepared for the second filtering condition is “News”, “Movie”, “Music” and “Unspecified”. 
   When the user specifies one of these genres, the URLs tracing to the contents contained in this specified genre are collected. The user may specifies a combination of a plurality of options excluding “Unspecified”. 
   The last of the three filtering conditions is “Is a keyword specified?”. Options prepared for the last filtering condition are “Specified” and “Unspecified”. If the user selects “Specified”, the user may specify a keyword. With this keyword specified, the URLs tracing to the contents presumed to be related to this keyword are collected. 
   The content related to the keyword implies what this keyword is contained in a site name of a content provider site or in a content title name contained in link information to the content. 
   The user, after setting those conditions, presses the “Creation” button by use of the pointing device  7 , the management server  11  starts searching the URLs and creating the EPG. 
     FIG. 5  shows the example of the EPG display screen  32  displayed on the PC  1 . This EPG is created in an HTML format on the management server  11 . The browser running on the PC  1  accesses the management server  11  and gets the EPG display screen  32  displayed thereon. 
   The EPG display screen  32  contains, sequentially from the upper area of the screen, the title, a filtering condition display field  33 , an EPG display box  34 , an advertisement display box  36  and a “From-beginning reproduction” button  37 . 
   The title “RPG world” and the filtering condition display field  33  are displayed in the upper area of the screen. The filtering conditions set on the EPG creation request screen  31  shown in  FIG. 4 , are displayed in the filtering condition display field  33 . 
   The EPG display box  34  is configured by a combination of a plurality of content columns  35 . Each content column  35  indicates a reproduction time of each content, a reproduction period thereof, a site title name of the content and a URL. 
   The reproduction time of each content is displayed such as 00:00˜00:10. “00:00” indicates 0 past 0. This time is a relative time wherein an arbitrary reproduction start time is set at 00:00. 
   The user may, however, sets this time coincident with a real time by using an unillustrated environment setting function. With this function, the browser reproduces consecutively the contents described in the EPG, synchronizing with the real time. Further, the user may also display the reproduction time to the second by using the unillustrated environment setting function. 
   The reproduction period is displayed such as 00:15. “00:15” indicates that the reproduction period is 0 hour and 15 minutes. The user may also display the reproduction period to the second by using the unillustrated environment setting function. 
   The reproduction period is what is obtained from the content pointed by the URL when the management server  11  searches the respective URLs. 
   The user may set the reproduction periods for the text and the still image by the unillustrated environment setting function. A setting time for the text is set such as 5 sec/line. The text is thereby displayed by scrolling at a speed of 5 sec/line. A setting time for the still image is set such as 60 sec/frame. A frame of still image is thereby displayed for 60 seconds. 
   The site title name of the content is a name of the site for providing the content concerned. Referring to  FIG. 5 , for example, “News Today” and “International Today” are displayed. 
   A banner advertisement is displayed in the advertisement display box  36 . The management server  11  distributes the banner advertisement in accordance with a contract with the customer. 
   In a state where the EPG describe above is displayed, the user, when pressing the “From-beginning reproduction” button by the pointing device  7 , the contents start being reproduced from the content set at 00:00. During the reproduction of the content, an enhanced pattern  38  for showing an on-reproducing state is displayed over the content display column  35 . 
   &lt;Data Structure&gt; 
     FIG. 6  shows the example of data structure of the orientation database  21 . The management server  11  uses the orientation database  21  in order to search the content provider site to which it has a first access. 
   Each record of the orientation database  21  consists of pieces of data in an “Item number” field, a “Server URL” field, a “Site title name” field, a “Content genre” field and a “Main data category” field. 
   The item number is a serial number for identifying each record. The server URL is an URL for indicating the content provider site. The site title name is a name of the content provider site. The content genre is a genre of the content concerned such as news, movie, music etc. The main data category is a type of the content concerned such as voices, sounds, animated image etc. 
     FIG. 7  shows the example of data structure in the content judgement table for judging the content. The management server  11 , when searching the URLs, uses the content judgement table for judging a data category of the content indicated by the URL. 
   The management server  11  judges the data category of the content that is retained in its file from an extension (suffix) of the file name of the file containing the content indicated by the searched URL. For example, if a file name is given such as xxxx.mpg, the management server  11  judges that the content is an MPEG formatted animated image. 
   For making such a judgement, the content judgement table is structured of an “Extension” field, a “Data category” field and a “Format” field. The “Extension” field has extensions of file names of the files containing the contents. The extensions are, e.g., .au, .snd, .aif, .wav, .mp3 that are related to the sounds, mpg, mpg, .qt, .mov, avi that are related to the animated images, .jpg, .tif, .xbm, .pdf, .pcx, .pct that are related to the still images, .txt related to the text, .html., .xml that are related to the documents, and .doc., .jtd that are related to document creation applications. 
   The “Data category” field has categories of the data retained in the files of which the file names include the extensions. The data categories are, for instance, the sound, the animated image, the still image, the text and the document. The “Format” field has-data formats of the contents. 
   &lt;Functions and Effects&gt; 
     FIG. 8  shows processing steps of the EPG creation program executed by the CPU  12  in the management server  11 . On the EPG creation request screen  31  of the PC  1 , the management server  11 , when detecting an event of pressing the “Creation” button, executes the EPG creation program. 
   In this process, the CPU  12  of the management server  11 , to start with, reads a piece of user input information, i.e., a filtering condition on the EPG creation request screen  31  (S 1 ) Next, the CPU  12  searches the orientation database  21 . Then, the CPU  12  searches a web page of the content provider site coincident with the filtering condition (S 2 , search/readout of server information). 
   Subsequently, the CPU  12  searches a URL from the HTML file describing the web page (S 3 ). Next, the CPU  12  registers the searched URL in the EPG (s 4 ). 
   Then, the CPU  12  judges whether or not a next item of data is left in the orientation database  21  (S 5 ). 
   If the next item of data remains in the orientation database  21 , the CPU  12  loops the control back to S 2 . Whereas if the next item of data does not remain in the orientation database  21 , the CPU  12  creates the EPG in a web page format(S 6 ). Further, in this case, a predetermined advertisement in the advertisement database  22  is incorporated into the web page. 
   Note that a creation sequence of the EPG by use of the URLs obtained by the search process, i.e., a sequence of reproduction/display process of the content data may be set as a sequence of the URLs obtained or may be determined by a random process. This sequence may be determined otherwise, e.g., by a predetermined sorting sequence. 
   Next, the CPU  12  distributes the created EPG to the client (S 7 ). Thereafter, the CPU  12  finishes the processing of the EPG creation program. 
     FIG. 9  shows details of the URL search process. In this process, the CPU  12  at first judges whether it is time-over or not (S 30 ). If judged to be time-over, the CPU  12  finishes the processing. 
   Whereas if judged not to be time-over, the CPU  12  reads a link destination of the HTML file describing the web page of the content provider site (S 31 ). 
   Next, the CPU  12  judges whether or not there is a further link next to that link destination (S 32 ). If the next link exists, the CPU  12  executes a recursive call of the URL search process. The URL search process is thereby executed with respect to the further link destination next to the former link destination. Thereafter, the CPU  12  advances the control to S 37 . 
   While on the other hand, if judging in S 32  that there is not the next link destination, the CPU  12  judges whether or not the file of the link destination is a file that has been defined in a content definition table (S 34 ). 
   If the file of the link destination is judged not to be the file defined in the content definition table, the CPU  12  advances the control to S 37 . If the file of the link destination is judged to be the file defined in the content definition table, the CPU  12  judges whether or not the file of the link destination is coincident with the filtering condition (S 35 ). 
   If the file of the link destination is not coincident with the filtering condition, the CPU  12  advances the control to S 37 . If coincident with the filtering condition, the CPU  12  saves the reproduction period of the content and the site title name in the memory  13  (S 36 ). 
   Next, the CPU  12  judges whether or not the HTML file which is being searched at the present has a next link destination (S 37 ). If there is the next link destination, the CPU  12  loops the control back to S 31 . Whereas if the next link destination does not exist, the CPU  12  finishes the URL search process. 
     FIG. 10  shows steps of a content auto reproduction process based on the relative time. This function is provided as a browser function on the PC  1 . When the user gives an EPG auto reproduction command during an execution of the browser, the CPU  2  of the PC  1  executes the process in  FIG. 10 . 
   In this process, the CPU  2 , to be gin with, judges whether or not the content is being reproduced (S 100 ). Whether the content is being reproduced or not is clearly shown in a predetermined state register. If the content is in the process of being reproduced, the CPU  2  waits till the reproduction is ended. 
   Whereas if not in the process of being reproduced, the CPU  2  judges whether or not an indication of end is given from the user (S 101 ). If given the indication of end, the CPU  2  finishes the content auto reproduction process. 
   Whereas if not given, the CPU  2  reads a next URL in the EPG (S 102 ). Herein, the “next URL” is a URL described ina column next to the content column  35  (see  FIG. 5 ) in the EPG which indicates the content in the process of being reproduced at the present. 
   Next, the CPU  2  records an on-EPG position of the content column  35  of the content in the process of being reproduced (S 103 ) This position is used for searching a next content. 
   Subsequently, the CPU  2  judges whether or not a category of the content indicated by the URL (read out in S 102 ) is the sound (including the vocal sounds and music). If the indicated content is categorized as the sound, the CPU  2  requests a sound reproduction program to reproduce the sound (S 105 ). This request is to request a decoder to decode, e.g., MP 3  data. Thereafter, the CPU  2  loops the control back to S 100 . 
   Whereas if the category of the content indicated by the URL concerned is not the sound, the CPU judges whether the category of the content is the animated image or not (S 106 ). If categorized as the animated image, the CPU  2  requests a animated image reproduction program to reproduce the animated image (S 107 ). This request is to request the decoder to decode, e.g., MPEG data. Thereafter, the CPU  2  loops the control back to S 100 . 
   Whereas if the category of the content indicated by the same URL is not the animated image, the CPU  2  judges whether or the category of the content is the still image or not (S 108 ). If the content is the still image, the CPU  2  requests a still image display program to display the image for a predetermined time (S 109 ). 
   Thereafter, the CPU  2  returns the control to S 100 . If the still image is based on, e.g., a JPEG format, the decoder is requested to decode JPEG data, and the decoded data are displayed for a predetermined period of time. 
   If the content indicated by the URL is not the still image, the CPU  2  judges whether the category of the content is the document or not (S 110 ). If judged to be the document, the CPU  2  requests a document program to display the document for a predetermined time (S 111 ). Thereafter, the CPU  2  loops the control back to S 100 . With this process, for instance, the text and the image are displayed by scrolling at a predetermined speed. 
   If the content indicated by the URL is not the document, the CPU  2  returns the control directly to S 100 . 
     FIG. 11  is a flowchart showing the content auto reproduction process synchronizing with a real time. When the user gives a command of an EPG auto reproduction after setting to synchronize the EPG time with the real time by use of the unillustrated environment setting function, processes shown in  FIG. 11  are executed. 
   The processes in  FIG. 11  are substantially the same as those in  FIG. 10  excluding S 102   a  and S 103   a . Such being the case, the same processes are marked with the same symbols, and their repetitive explanations are omitted. 
   The present content reproduction process is ended, and, if the user does not give the indication of end, the CPU  2  obtains the present time from a timer (S 102   a ). 
   Next, the CPU  2  searches from the EPG a content scheduled to be reproduced in the vicinity of the present time. This is attained by obtaining the content column  35  (see  FIG. 5 ) of the content that starts being reproduced within a time range with an error on the order of  30  sec from the present time. The thus obtained content indicated by the URL is reproduced in the same way as in the case of  FIG. 10  (S 104  through Sill). 
   As discussed above, according to the information search system in the first embodiment, the management server  11  collects the URLs tracing to the contents retained by the content severs or the management server  11  itself in the network, then creates the EPG and distributes the EPG to the client. The client is able to reproduce or display the contents on the network in accordance with this EPG as if receiving a TV and a radio. 
   Further, on the occasion of creating the EPG, the user is able to specify the desired data category, genre and filtering condition based on the keyword, and to create the EPG coincident with this condition. 
   &lt;Modified Example&gt; 
   [Modification of Hardware Architecture] 
   The information search system in the first embodiment involves the use of the personal computer as the client. The personal computer may be of a notebook type or a desktop type. 
   Further, the client may be one of a mobile information terminal that is a so-called PDA (Personal Digital Assistants), a mobile telephone, a digital TV, a set-top box to which a TV monitor is connected, and so on. 
   [Modification of Data Format] 
   In the first embodiment, the EPG is described in the HTML format. The embodiment of the present invention is not, however, limited to the procedures defined by the HTML. The EPG may be described by, for example, XML (Extensible Markup Language). Further, the EPG may also be described in a plain text format, a sheet format of a spreadsheet program, and a document format of a word processor program, for example, a document file format of Word by Microsoft Corporation, U.S.A. 
   In the first embodiment, the management server  11  searches the HTML describing the web page of the content provider site and further searches the URL for indicating the content. The embodiment of the present invention is not, however, confined to such procedures. For instance, the management server  11  may search the data described by the XML and further search the URL to the content. 
   Moreover, the management server  11  may search the HTML simplified for the mobile telephone, e.g., the HTML corresponding to i-mode services provided by NTT DoCoMo Co., Ltd. 
   [Time-Out Process] 
   According to the EPG creation program in the first embodiment, the CPU  12  judges whether it is time-out or not, and finishes the URL search process. The embodiment of the present invention is not, however, limited to the process described above. The user may specify, for example, a maximum search count, a maximum search page count or a maximum search content count, and the search may be finished just when one of these count values is reached in the search process. 
   Further, the URL search process may also be ended with an event by the user instead of the time-out process. For attaining this end mode, an “End” button is provided on the unillustrated browser screen, and there may be detected a manipulation of pressing this button by the pointing device  7 . When the “End” button is pressed, the browser may notify the program for executing the processes in  FIG. 9  that the “End” button has been pressed. Then, for instance, in the process in S 30  shown in  FIG. 9 , it may be judged whether the “End” button is pressed or not instead of making the time-out judgement. 
   [Content Data Category Judging Method] 
   The data category is judged from the extension of the file name of the file that retains the content by use of the content judgement table shown in  FIG. 7  in the first embodiment. The embodiment of the present invention is not, however, limited to the structure and procedures described above. For example, a file header of the file that retains the content is read, and the data category may be judged from the header information thereof. 
   Second Embodiment 
   A second embodiment of the present invention will be described with reference to  FIGS. 12 and 13 .  FIG. 12  is diagram showing an outline of a system architecture of the information search system in the second embodiment.  FIG. 13  is a flowchart showing processes of the EPG creation program executed by the PC  1  shown in  FIG. 12 . 
   In the first embodiment, the management server  11  searches the URL indicating the content on the network and creates the EPG in response to the client request. 
   According to the information search system in the second embodiment, the PC  1  defined as the client executes the EPG creation program. The PC  1  then creates the EPG, and reproduces and displays the content. Other configurations and functions are the same as those in the first embodiment. Then, the same components are marked with the same numerals, and their repetitive explanations are omitted. 
     FIG. 12  shows the outline of the system architecture of the information search system in the second embodiment. In the second embodiment, the PC  1  as the client has the orientation database  21 . Further, the PC 1  executes the same EPG creation program as that of the management server  11  in the first embodiment. 
   Then, the PC  1 , based on the orientation database  21 , searches the content servers on the network or its own data base, thereby creating the EPG. The browser, to which this EPG is transferred, reproduces the content in accordance the EPG. 
     FIG. 13  shows the processes of the EPG creation program executed by the PC  1 . This program is executed as one of the browser functions or as a function of controlling the browser. The processes in S 1  through S 6  of this program are the same as those of the EPG creation program in the first embodiment, and the repetitive explanations thereof are omitted. 
   In the second embodiment, the PC  1  generates the EPG in the web page format and thereafter displays the EPG (S 7   a ). The user, based on the RPG displayed, gets the content reproduced or displayed. The user may command the browser to consecutively output the contents in accordance with the EPG. 
   As discussed above, according to the information search system in the second embodiment, the client executes the EPG creation program. Accordingly, the client is capable of searching the URL for indicating the content and creating the EPG without accessing the management server  11 . 
   &lt;&lt;Readable-by-Computer Recording Medium&gt;&gt; 
   The program of the management server  11  or the client in the embodiments discussed above may be recorded on a readable-by-computer recording medium. Then, a computer reads the program from this recording medium and executes the same program, thereby functioning as the management server  11  or the client exemplified in the embodiments discussed above. 
   Herein, the readable-by-computer recording medium embraces recording mediums capable of storing information such as data, programs, etc. electrically, magnetically, optically and mechanically or by chemical action, which can be all read by the computer. What is demountable out of the computer among those recording mediums may be, e.g., a floppy disk, a magneto-optic disk, a CD-ROM, a CD-R/W, a DVD, a DAT, an 8 mm tape, a memory card, etc. 
   Further, a hard disk, a ROM (Read Only Memory) and so on are classified as fixed type recording mediums within the computer. 
   &lt;Data Communication Signal Embodied in Carrier Wave&gt; 
   Furthermore, the above program may be stored in the hard disk and the memory of the computer, and downloaded to other computers via communication media. In this case, the program is transmitted as data communication signals embodied in carrier waves via the communication media. Then, the computer downloaded with this program can be made to function as the management server  11  or the client in the embodiments discussed above. 
   Herein, the communication media may be any one of cable communication mediums such as metallic cables including a coaxial cable and a twisted pair cable, optical communication cables, or wireless communication media such as satellite communications, ground wave wireless communications, etc. 
   Further, the carrier waves are electromagnetic waves for modulating the data communication signals, or the light. The carrier waves may, however, be DC signals. In this case, the data communication signal takes a base band waveform with no carrier wave. Accordingly, the data communication signal embodied in the carrier wave may be anyone of a modulated broadband signal and an unmodulated base band signal (corresponding to a case of setting a DC signal having a voltage of 0 as a carrier wave).