JP5922640B2 - Browsing control device, browsing control method, and browsing control program - Google Patents

Description

  The present invention relates to a browsing control device, a browsing control method, and a browsing control program that control browsing of a Web page in a browser.

  2. Description of the Related Art Conventionally, a technique for restricting browsing of a Web page including harmful content to a minor or the like is known (for example, see Patent Document 1 or 2 below). In the following Patent Document 1, identification information is given to a terminal in advance, a level for permitting access is set, and the identification information of the terminal, the level, and access to this level are desired to be restricted on the Internet in advance. A management site for storing the URL of the site is provided, and when the terminal accesses the site on the Internet, the URL of the site, the identification information of the terminal, and the level are transmitted from the terminal to the management site via the Internet. When it is determined that access is prohibited based on the URL, identification information, and level of the site received, the display of information is prohibited on the terminal, and the information is displayed on the terminal when it is determined that access is not prohibited Alternatively, a technique that enables output is disclosed. Further, in Patent Document 2 below, a database of useful word keywords is provided, and even if the content includes prohibited word keywords, it is determined that the content includes useful information if the useful word keywords are included. A technique that enables browsing is disclosed.

Japanese Patent No. 36553242 Japanese Patent No. 3605343

  However, in the above-described conventional technology, it is not possible to access a Web page including harmful content that is prohibited from browsing (hereinafter referred to as “browsing prohibited content”). For this reason, for example, even if it is a Web page containing useful content, if some of the browsing prohibited content is included, it cannot be browsed, and the useful content cannot be accessed There is.

  Also, for example, in a Web page that partially includes prohibited browsing content, if only the prohibited browsing content part is deleted or not displayed, the layout of the Web page will be destroyed, the appearance may be impaired, or a display error may occur. There is a problem that it seems to have occurred.

  In order to solve the above-described problems caused by the prior art, the present invention provides a browsing control device that prevents browsing only browsing-prohibited content while maintaining the layout of the Web page in a Web page partially including browsing-prohibited content. An object of the present invention is to provide a browsing control method and a browsing control program.

In order to solve the above-described problems and achieve the object, a browsing control device according to the present invention is a browsing control device that controls browsing of a Web page using a browser, and issues a browsing request for the Web page from the browser. receiving said constitutes a Web page, sequentially it acquires from the first resource data divided into the data length of a predetermined unit, for each acquired the resource data, stores the location in advance start tag and end tag appeared and the Web in a page whether contains viewing prohibited contents determined before each cut data source, if the it is determined to contain a viewing prohibited contents, the end tag of the viewing prohibited contents position but which appeared, a position in which the start tag corresponding to the closing tag is encountered, before the start tag and the end tag appears Resource data identifies each case where said start tag and the end tag appears in separate the resource data, the Web page based on the said start tag and the end tag, the viewing prohibited content is displayed range above (hereinafter, "viewing prohibited range" hereinafter) is specified for each prior Symbol resource data, said viewing prohibited range specified, the place of the viewing prohibited contents, other same size as the viewing prohibited contents wherein the resource data the viewing prohibited range is identified as the display contents are displayed by replacing each said along with the resource data which the replacement is not performed, and outputs sequentially the browser the resource data that is substituted, the to.
Also, the browsing-control method according to the present invention is a viewing control method browsing control device for controlling the viewing of Web pages using a browser executes accepts request for viewing the Web page from the browser, the Web constituting the page, sequentially acquires from the first resource data divided into the data length of a predetermined unit, for each acquired the resource data, and storing the position in advance start tag and the end tag is encountered, the Web It determines whether contains viewing prohibited contents before each cut source data into the page, if the it is determined to contain a viewing prohibited contents, the end tag of the viewing prohibited contents appeared position When the position of the start tag corresponding to the closing tag is encountered, the resource data to which the start tag and the end tag appears The identified respectively, when said start tag and the end tag appears in separate the resource data, based on the said start tag and the end tag, on the Web page to which the viewing prohibited content is displayed range (hereinafter, referred to as "viewing prohibited ranges") to identify every prior Symbol resource data, the viewing prohibited range specified, the place of the viewing prohibited contents, other display contents of the same size with the viewing prohibited contents Each of the resource data for which the browsing prohibited range is specified is replaced so that is displayed , and the replaced resource data is sequentially output to the browser together with the resource data that has not been replaced. .
A browsing control program according to the present invention is a browsing control program that is executed by a browsing control device that controls browsing of a Web page using a browser, and receives a browsing request for the Web page from the browser. constituting sequentially acquires from the first resource data divided into the data length of a predetermined unit, for each acquired the resource data, and storing the position in advance start tag and the end tag is encountered, the Web pages If the viewing prohibited contents determined for each and whether the pre-cut source data is included, it is determined that the contains viewing prohibited contents within, a position where the end tag of the viewing prohibited contents appeared , a position in which the start tag corresponding to the closing tag is encountered, before the start tag and the end tag appears Resource data identifies each case where said start tag and the end tag appears in separate the resource data, the Web page based on the said start tag and the end tag, the viewing prohibited content is displayed range above (hereinafter, "viewing prohibited range" hereinafter) is specified for each prior Symbol resource data, said viewing prohibited range specified, the place of the viewing prohibited contents, other same size as the viewing prohibited contents the resource data the viewing prohibited range is identified as the display contents are displayed by replacing each said substituent is the along with the resource data that has not been made, and outputs sequentially the browser the resource data that is substituted, the process computer It is made to perform .
The browsing control apparatus according to the present invention is a browsing control apparatus that controls browsing of a web page using a browser, the browsing request acquisition means for acquiring a browsing request for the web page from the browser, and the web page Resource data acquisition means for acquiring resource data that constitutes, a determination means for determining whether or not browsing prohibited content is included in the Web page, and the browsing prohibition content is included in the determination means If determined, the specifying means for specifying the range on the Web page (hereinafter referred to as “browsing prohibited range”) where the browsing prohibited content is displayed, and the browsing prohibited range specified by the specifying means Replacing means for replacing the resource data so that other display contents in place of the browsing-prohibited contents are displayed; Characterized in that and an output means for outputting the resource data that is substituted in the browser by means.

According to the inventions of this, to identify the extent to which harmful content to be included within the Web page (View prohibited content) is displayed, replace the range to the other display contents. For this reason, it is possible to prevent browsing prohibited content from being displayed on the browser without destroying the layout of the Web page. Further, since it is possible to browse contents other than the browsing-prohibited content in the web page, browsing of useful content included in the web page is not hindered.

In the browsing control apparatus according to the present invention, in the above invention, the resource data acquisition unit acquires the resource data by dividing it into data lengths of a predetermined unit, and the determination unit acquires the divided resource The determination is performed for each data, the specifying unit specifies the browsing prohibition range for each of the divided resource data, and the replacement unit performs the replacement for each of the divided resource data, The output means outputs the divided resource data to the browser.

According to inventions of this, since the process every time to get the divided resource data, as compared to process the resource data of the entire Web page, it can be rapidly output to the browser. Further, since only the divided resource data needs to be processed, it is possible to reduce the storage area secured in the browsing control device as compared to processing the resource data of the entire Web page.

In the browsing control device according to the present invention, in the above invention, the specifying unit searches the information related to a start point and an end point of the browsing prohibited content included in the resource data, and specifies the browsing prohibited range. It is characterized by.

According to inventions of this, since specifying the start and end points of view prohibited contents by analyzing the data structure of the resource data, it is possible to identify the exact viewing prohibited range. In addition, for example, even when resource data is divided in one sentence, it is possible to quickly specify a portion that should be a browsing prohibited range.

In the browsing control device according to the present invention, in the above invention, the specifying unit searches the resource data for information indicating a position where the browsing prohibited content is displayed and a size of the browsing prohibited content. The browsing prohibition range is specified, and the replacement means replaces the resource data so that the other display content having the same size as the browsing prohibition content is displayed at a position where the browsing prohibition content is displayed. Features.

According to the inventions of this, the position where the viewing prohibited content is displayed, since the other of the display of the same size as the viewing prohibited content, avoiding the display of browsing prohibited content without breaking the layout of the Web page Can do.

In the browsing control device according to the present invention, in the above invention, the other display content is a content for notifying that the content displayed in the browsing prohibited range is harmful.

According to the inventions of this, it is possible to notify that it contains the viewing prohibited content in the Web page to the user.

The browsing control device according to the present invention is characterized in that, in the above invention, the browsing control device is a proxy server connected to the Internet instead of the client device, and the browser is mounted on the client device. And

According to the inventions of this, the view of the Web page in the client device, can be centrally managed by the proxy server.

The browsing control method according to the present invention is a browsing control method in a browsing control device that controls browsing of a web page by a browser, the browsing request acquisition step of acquiring a browsing request for the web page from the browser, A resource data acquisition step of acquiring resource data constituting a Web page, a determination step of determining whether or not browsing prohibited content is included in the Web page, and the browsing prohibition content included in the determination step If it is determined that the browsing prohibited content is specified, a range on the Web page in which the browsing prohibited content is displayed (hereinafter referred to as “browsing prohibited range”), and the browsing prohibited range specified in the specific step are specified. , A replacement process for replacing the resource data so that other display contents in place of the browsing prohibited contents are displayed. When, characterized in that it contains, and an output step of outputting the resource data that is substituted with the substitution step to the browser.

According to the inventions of this, to identify the extent to which harmful content to be included within the Web page (View prohibited content) is displayed, replace the range to the other display contents. For this reason, it is possible to prevent browsing prohibited content from being displayed on the browser without destroying the layout of the Web page. Further, since it is possible to browse contents other than the browsing-prohibited content in the web page, browsing of useful content included in the web page is not hindered.

A browsing control program according to the present invention causes a computer to execute the browsing control method described above .

According to inventions of this, it is possible to execute the browsing control method in a computer.

  As described above, according to the browsing control device, the browsing control method, and the browsing control program according to the present invention, only the browsing-prohibited content is maintained while maintaining the layout of the Web page in the Web page partially including the browsing-prohibiting content. Can not be viewed.

It is explanatory drawing which shows the system configuration | structure of the web page browsing system concerning embodiment. It is explanatory drawing which showed typically the access control to the internet by a proxy server. It is a block diagram which shows the hardware constitutions of a proxy server. It is a block diagram which shows the functional structure of a proxy server. It is a flowchart which shows the procedure of the browsing control process by a proxy server. It is explanatory drawing which shows the example of a display of the web page containing a browsing prohibition content. It is explanatory drawing which shows the packet of resource data typically.

  Exemplary embodiments of a browsing control device, a browsing control method, and a browsing control program according to the present invention will be explained below in detail with reference to the accompanying drawings.

(Embodiment)
(System configuration)
FIG. 1 is an explanatory diagram illustrating a system configuration of the Web page browsing system according to the embodiment. The web page browsing system 100 according to the embodiment includes a proxy server 110, a client 120, and a management terminal 130. The proxy server 110 controls access to the Internet 140 by the client 120 (120a to 120c). More specifically, the proxy server 110 analyzes and filters the content of the HTTP request from the client 120 (HTTP filtering function), or the resource data of the Web page transmitted from the Web server 150 on the Internet 140 Perform content filtering (content filtering function).

  FIG. 2 is an explanatory diagram schematically showing access control to the Internet by a proxy server. First, the proxy server 110 receives a web page browsing request (request data) from the client 120 (step S201). The proxy server 110 performs filtering on the request data (step S202). If it is determined that the browsing request is permitted as a result of filtering, the proxy server 110 transmits the request data to the Web server 150 that provides the resource data of the Web page (step S203). When resource data (response data) is received from the web server 150 in response to the request data (step S204), the proxy server 110 further filters the response data (step S205). As a result of filtering, when it is determined that the web page can be permitted, the proxy server 110 returns resource data to the client 120 (step S206). Then, the browsing history of the Web page by the client 120 or the history when the browsing could not be performed is recorded in the log 230 (step S207).

  Here, the setting file 210 and the various filters 220 are used in the filtering processes in steps S202 and S205. In the setting file 210, Web pages that are permitted to be browsed are set for each client 120 and each group of clients 120. For this setting, a URL included in the Web page, the content of the Web page, the genre, etc. are used in addition to the URL of the Web page. Setting in the setting file 210 is performed by the management terminal 130.

  The various filters 220 perform filtering based on the contents of the setting file 210. For example, the URL filter 221 determines whether the URL included in the Web page browsing request (HTTP request) is the URL of a Web page that is prohibited from browsing. In the case of a URL of a Web page that is prohibited from being browsed, the client 120 is returned to the client 120 that the Web page is prohibited from browsing without accessing the Web server 150 that provides the Web page.

  The header filter 222 analyzes the header information of the request data and the response data, and determines whether the data is a browsing request or resource data of a Web page that is prohibited from browsing. In the case of a browsing request or resource data for a Web page whose browsing is prohibited, the proxy server 110 returns to the client 120 that the Web page is prohibited from browsing.

  The PICS filter 223 filters Web pages using PICS (Platform for Internet Content Selection) information. The PICS information is evaluation information given by a web page operator on the Internet 140. When the PICS information given to the Web page indicates the content prohibited from browsing, the proxy server 110 returns to the client 120 that the Web page is prohibited from browsing.

  The content filter 224 analyzes the content (text, images, etc.) of the Web page included in the response data, and determines whether or not the Web page includes content that is prohibited from browsing (viewing prohibited content).

  Here, when browsing prohibited content is included in the Web page, in general, the Web page is returned to the client 120 that browsing is prohibited so that the Web page is not browsed. On the other hand, in the proxy server 110 according to the embodiment, when browsing prohibited content is included in the Web page, only the browsing prohibited content portion in the Web page is replaced with other display content. As a result, it is possible to browse a Web page or the like that contains harmful content in part but contains useful content as a whole.

  The various filters 220 described above are learning filters such as a Bayes filter. For example, when a Web page that should be prohibited from browsing is found, the management terminal 130 registers this Web page as a non-viewable page. At this time, the learning type filter not only stores the URL of the Web page but also learns the content of the Web page. As a result, it is possible to prevent browsing of Web pages having similar contents.

  Returning to the description of FIG. 1, the client 120 (120a to 120c) is an information processing device used in a specific group. For example, an information processing device used by a student in a class at school or an employee at a company. Information processing apparatus. As the client 120, for example, a personal computer can be used. Each client 120 is equipped with an Internet browser and can browse web pages. However, the client 120 cannot directly connect to the Internet 140, and acquires the resource data of the Web page via the proxy server 110 and browses the Web page. At this time, the proxy server 110 can prevent browsing of Web pages including harmful contents from the client 120 by the various filtering functions described above.

  In this way, by restricting access from the client 120 to the Internet 140 using the proxy server 110, it is possible to centralize management of Web pages that are prohibited from browsing.

  The management terminal 130 manages Web pages that can be browsed by the client 120. Specifically, the management terminal 130 registers the web page browsing authority in each client 120 in the setting file 210 (see FIG. 2), and the web page forbidden to browse in the various filters 220 (see FIG. 2). Or register. Note that the management terminal 130 may be able to register not only Web pages that are prohibited from browsing but also Web pages that the client 120 wants to actively browse. Further, the management terminal 130 and the client 120 may be physically the same terminal. For example, the management authority may be switched by password authentication at the time of login.

  In this embodiment, the proxy server 110 is provided with the function of the browsing control device according to the present invention. However, the present invention is not limited to this. For example, each client 120 may have the function of the browsing control device. Good. In this case, each client 120 may connect directly to the Internet 140 without installing the proxy server 110.

(Hardware configuration of proxy server 110)
Next, the hardware configuration of the proxy server 110 will be described. FIG. 3 is a block diagram illustrating a hardware configuration of the proxy server. As shown in FIG. 3, the proxy server 110 includes a CPU 301, a ROM 302, a RAM 303, an HDD (hard disk drive) 304, an HD (hard disk) 305, an FDD (flexible disk drive) 306, and an FD (flexible disk) 307. A CD-RWD (CD-RW drive) 308, a CD-RW 309, a display 310, an input device 311, and a network I / F 312. Each of the above-described configurations 301 to 312 is connected to the bus 320.

  In the proxy server 110 configured as described above, the CPU 301 controls the entire proxy server 110. The ROM 302 stores a browsing management program according to the present invention. The browsing management program stored in the ROM 302 is read out and executed in accordance with control from the CPU 301. The RAM 303 is used as a work area for the CPU 301.

  The HDD 304 controls reading / writing of data with respect to the HD 305 according to the control of the CPU 301. The HD 305 is a storage medium that stores data written according to the control of the HDD 304. Further, the data stored in the HD 305 is appropriately read according to the control of the HDD 304.

  The FDD 306 controls reading / writing of data with respect to the FD 307 according to the control of the CPU 301. The FD 307 is a detachable storage medium that stores data written according to the control of the FDD 306. Further, the data stored in the FD 307 is appropriately read according to the control of the FDD 306.

  The CD-RWD 308 controls reading / writing of data with respect to the CD-RW 309 according to the control of the CPU 301. The CD-RW 309 is a detachable storage medium that stores data written according to the control of the CD-RWD 308. Further, the data stored in the CD-RW 309 is appropriately read according to the control of the CD-RWD 308.

  The display 310 displays various data such as a cursor, a menu, a window, or characters and images under the control of the CPU 301. The input device 311 is a remote controller, a keyboard, a touch panel, or the like provided with a plurality of keys for inputting characters, numerical values, various instructions, and the like. The input device 311 may be realized by any one form of a remote control, a keyboard, and a touch panel, but can also be realized by a plurality of forms.

  The network I / F 312 is connected to a network such as a LAN or the Internet 140 via a communication cable or the like, and functions as an interface between the network and the CPU 301. The proxy server 110 is connected to the client 120 and the Internet 140 via the network I / F 312.

  The proxy server 110 according to the present embodiment includes the hardware described above, and controls browsing of the Web page by the client 120 by executing a browsing control program stored in the ROM 302 under the control of the CPU 301. be able to. Note that the client 120 and the management terminal 130 also have the same hardware configuration as the proxy server 110 described above.

(Functional configuration of proxy server 110)
Next, the functional configuration of the proxy server 110 will be described. FIG. 4 is a block diagram illustrating a functional configuration of the proxy server. The proxy server 110 includes a browsing request acquisition unit 411, a resource data acquisition unit 412, a determination unit 413, a specification unit 414, a replacement unit 415, and an output unit 416, and controls browsing of Web pages using the browser 421 in the client 120. To do.

  The browsing request acquisition unit 411 acquires a Web page browsing request from the browser 421 of the client 120. The web page browsing request is request data including a URL of a predetermined web page. Specifically, the browsing request acquisition unit 411 is, for example, a network I / F 312 and acquires a browsing request via a LAN or the like.

  The resource data acquisition unit 412 acquires resource data constituting the web page. The resource data acquisition unit 412 transmits resource data request data to the Web server 150 (see FIG. 2) via the Internet 140 (see FIG. 2). Then, the resource data is acquired by receiving the resource data returned from the Web server 150 corresponding to the request data. The resource data acquisition unit 412 acquires resource data by dividing it into data lengths of a predetermined unit, that is, packet units.

  The determination unit 413 determines whether browsing prohibited content is included in the Web page. For example, when the text data in the resource data includes a predetermined prohibited word / phrase, the determination unit 413 determines that the Web page includes browsing prohibited content. If the file name (data with an extension of .jpg) matches a character string indicating a predetermined prohibited word / phrase, it is determined that the image data is browsing prohibited content. The determination unit 413 performs the above determination for each divided resource data, that is, for each packet.

  When the determining unit 413 determines that the prohibited browsing content is included, the specifying unit 414 specifies a range on the Web page where the prohibited browsing content is displayed (hereinafter referred to as “browsing prohibited range”). For example, the specifying unit 414 searches in advance for information related to the start point and end point of the browse-prohibited content included in the resource data, and specifies the browse-prohibited range. The information on the start point and the end point is, for example, an HTML start tag and an end tag when the resource data is described in HTML. Further, the specifying unit 414 may search the resource data for information indicating the position where the prohibited browsing content is displayed and the size of the prohibited browsing content, and specify the prohibited browsing range. For example, when the browsing-prohibited content is image content, information specifying the position where the image content is displayed and the size of the image content is searched from the resource data, and the browsing-prohibited range is specified. The identifying unit 414 performs the above identification for each divided resource data, that is, for each packet.

  The replacement unit 415 replaces the resource data so that other display contents instead of the browsing prohibited content are displayed in the browsing prohibited range specified by the specifying unit 414. The other display contents are contents for notifying that the contents displayed in the browsing prohibited range are harmful, for example. For example, the replacement unit 415 replaces the resource data so that other display contents having the same size as the browsing prohibited content are displayed at the position where the browsing prohibited content is displayed. The replacement unit 415 performs the above replacement for each divided resource data, that is, for each packet.

  The output unit 416 outputs the resource data replaced by the replacement unit 415 to the browser 421. That is, the output unit 416 outputs resource data to the browser 421 in response to the browsing request acquired by the browsing request acquisition unit 411. The output unit 416 outputs the divided resource data to each browser, that is, for each packet.

(Browsing control processing by proxy server 110)
Next, browsing control processing by the proxy server 110 will be described. As described above, the proxy server 110 controls browsing of the Web page by the client 120 using the various filters 220. In the following description, processing related to filtering by the content filter 224 (see FIG. 2) will be described.

  FIG. 5 is a flowchart illustrating a procedure of browsing control processing by the proxy server. In the flowchart of FIG. 5, the proxy server 110 stands by until there is a web page browsing request from the client 120 (step S501: No loop). More specifically, the proxy server 110 waits until web page request data is input from a browser installed in the client 120.

  When there is a web page browsing request (step S501: Yes), the proxy server 110 requests the web server 150 that provides the resource data of the web page to transmit the resource data of the web page (step S502). More specifically, the proxy server 110 transmits request data for the Web page to the Web server 150. At this time, the request data is filtered by the URL filter 221 or the like.

  Next, the proxy server 110 waits until it receives a packet of Web page resource data from the Web server 150 (step S503: No loop). Here, data flowing on the Internet 140 is normally divided into packets of less than 1500 bytes and transmitted. For this reason, the proxy server 110 receives a plurality of packets for one Web page.

  When the packet of resource data is received (step S503: Yes), the proxy server 110 determines whether or not browsing prohibited content is included in the packet (step S504). Whether or not browsing-prohibited content is included is determined using a general filtering technique. For example, it is determined whether or not a specific prohibited word / phrase is included in the text data (sentence) or image file name in the packet. Further, for example, an image having a prohibited word around (more specifically, an image having a link around the prohibited word) is likely to be an image related to the prohibited word, and thus is set as a browsing prohibited content.

  When browsing prohibited content is included (step S504: Yes), a display area (display range) of the browsing prohibited content in the Web page is specified (step S505), and the display of the area is replaced with other display contents. (Step S506). More specifically, the browsing-prohibited content portion in the resource data is deleted, and resource data for displaying other display contents is inserted instead. Here, the other contents are, for example, a message indicating that the display of the part has been restricted by the browsing control program (for example, a message display such as “Browsing is restricted”, or the name of the browsing control program). For example, a text display) or a solid color display.

  Then, the proxy server 110 returns a resource data packet to the client 120 (step S507). If no browsing-prohibited content is included in step S504 (step S504: No), the process proceeds to step S507, and the resource data packet is returned to the client 120 as it is. Until all the resource data packets constituting the Web page are received (step S508: No), the process returns to step S503, and the subsequent processing is repeated. When all the resource data packets are received (step S508: Yes), the processing according to this flowchart ends.

  FIG. 6 is an explanatory diagram illustrating a display example of a Web page including browsing-prohibited content. In the Web page 600 shown in FIG. 6, text information 611 and 612 and images 621 and 622 are displayed. Among these, the shaded part 611a and the image 621 in the text information 611 are determined to be browsing-prohibited contents (for example, grotesque expressions), and the display is replaced by the browsing control program. On the other hand, since the text information 612 and the image 622 are not browsing prohibited contents, they are displayed as usual.

  Thus, in the browsing control in the proxy server 110, an alternative display having the same size as the browsing-prohibited content is performed in the area where the browsing-prohibited content is displayed. On the other hand, for example, a method of prohibiting browsing of the browsing prohibited content by simply deleting the character string of the browsing prohibited content or not displaying an image is also conceivable. However, with this method, the layout of the Web page is broken, or an invalid link icon is displayed on the image part, making it difficult to obtain the necessary information because the Web page is difficult to view, and the viewer is mistaken for a system error. There is a problem.

  In the browsing control in the proxy server 110, browsing of prohibited browsing content is prohibited without destroying the layout of the Web page by performing an alternative display having the same size as the prohibited browsing content in the area where the prohibited browsing content is displayed. be able to. For this reason, the viewer can comfortably browse content other than the prohibited content on the Web page.

  In the browsing control in the proxy server 110, the presence / absence of browsing prohibited content is determined for each received packet. On the other hand, for example, a method may be considered in which all the resource data constituting the Web page is received and the determination is performed collectively. However, in order to make a determination after receiving all the resource data, a large-capacity storage area capable of storing all the resource data is always required. Further, when the capacity of the Web page is extremely large and it takes a long time to receive the resource data, the display of the Web page on the client 120 is delayed.

  In the browsing control in the proxy server 110, since the presence / absence of browsing prohibited content is determined for each received packet, a large-capacity storage area is not required. In addition, since the packet for which the determination is completed is sequentially returned to the client 120, the Web page can be displayed on the client 120 sequentially, and the response time from the Web page browsing request to the display start can be shortened.

  In the browsing control in the proxy server 110, since the presence / absence of browsing prohibited content is determined for each received packet, the Web page structure (HTML structure) must be determined in an incomplete state. Therefore, in the proxy server 110, if the HTML text is interrupted in the packet, it should be replaced by specifying the HTML start tag and end tag with the next received packet (or in advance). Determine the location.

  FIG. 7 is an explanatory diagram schematically showing a packet of resource data. FIG. 7 shows first packet data 701 and second packet data 702. This resource data constitutes the same Web page, but has been divided within a tag (<P> </ P>) indicating the HTML text. Since the second packet data 702 includes prohibited words related to dragging, it can be determined that this Web page includes prohibited browsing content. However, only the second packet data 702 indicates a place to be replaced. I can't judge.

  For this reason, the HTML end tag (</ HTML>) included in the second packet data 702 and the corresponding HTML start tag (<HTML>), that is, the HTML included in the first packet data 701 are the same. Check the start tag in advance and identify the place to be replaced. More specifically, the proxy server 110 stores the position where the tag appears when processing each packet data from the top. Then, the tag information checked in advance is used as necessary to identify the start point and end point of the content. Thereby, even when the HTML text is divided and transmitted in a separate packet, the browsing prohibited range can be specified at high speed.

  As described above, the proxy server 110 according to the embodiment specifies a range in which harmful content (browsing prohibited content) included in the Web page is displayed, and replaces the range with other display content. For this reason, it is possible to prevent browsing prohibited content from being displayed on the browser without destroying the layout of the Web page. Further, since it is possible to browse contents other than the browsing-prohibited content in the web page, browsing of useful content included in the web page is not hindered.

  Further, since the proxy server 110 according to the embodiment performs processing every time the divided resource data is acquired, the proxy server 110 performs output to the browser more quickly than processing the resource data of the entire Web page. be able to. Also, since only the divided resource data needs to be processed, the storage area secured in the proxy server 110 can be reduced compared to processing the resource data of the entire Web page.

  Further, since the proxy server 110 according to the embodiment sequentially analyzes the data structure of the resource data and specifies the start point and end point of the browsing prohibited content, the browsing prohibited range can be specified accurately. In addition, for example, even when resource data is divided in one sentence, it is possible to quickly specify a portion that should be a browsing prohibited range.

  In addition, since the proxy server 110 according to the embodiment performs another display having the same size as the browsing-prohibited content at the position where the browsing-prohibited content is displayed, the display of the browsing-prohibited content is performed without destroying the layout of the Web page. Can be avoided. In addition, if the proxy server 110 is configured to notify that the content displayed in the range is harmful in place of the display prohibited content, the content prohibited from viewing is included in the Web page. This can be notified to the user.

  The browsing control method described in the present embodiment can be realized by executing a program prepared in advance on a computer such as a personal computer or a workstation. This program is recorded on a computer-readable recording medium such as a hard disk, a flexible disk, a CD-ROM, an MO, and a DVD, and is executed by being read from the recording medium by the computer. The program may be a transmission medium that can be distributed via a network such as the Internet.

  As described above, the browsing control device, the browsing control method, and the browsing control program according to the present invention are useful for restricting browsing of web pages that partially contain harmful content, and in particular, schools and companies. It is suitable for a proxy server that restricts browsing of Web pages in a plurality of information processing apparatuses installed in an organization.

DESCRIPTION OF SYMBOLS 100 Web page browsing system 110 Proxy server 120 (120a-120c) Client 130 Management terminal 140 Internet 150 Web server 411 Browse request acquisition part 412 Resource data acquisition part 413 Determination part 414 Identification part 415 Replacement part 416 Output part 421 Browser

Claims (5)

A browsing control device that controls browsing of a web page using a browser,
Receiving a browsing request for the web page from the browser;
Sequentially acquiring resource data divided into data lengths of a predetermined unit constituting the Web page from the top;
For each retrieved the resource data, and storing the position in advance start tag and the end tag is encountered,
Determines whether contains viewing prohibited contents in the Web page before each cut source data,
When it is determined that the browsing prohibited content is included, the position where the end tag of the browsing prohibited content appears, the position where the start tag corresponding to the end tag appears , the start tag, and the end tag Identify each of the resource data in which
When the start tag and the end tag appear in different resource data, based on the start tag and the end tag, the range on the Web page where the browsing prohibited content is displayed (hereinafter, “ a) that the viewing prohibited ranges "specific to each before Symbol resource data,
In place of the browsing-prohibited content, the resource data in which the browsing-prohibited range is specified are replaced with the specified browsing-prohibited range so that other display contents having the same size as the browsing-prohibited content are displayed,
Along with the resource data that has not been replaced, the replaced resource data is sequentially output to the browser.
The browsing control apparatus characterized by the above-mentioned.   The browsing control apparatus according to claim 1, wherein the other display content is a content for notifying that the content displayed in the browsing prohibited range is harmful. The browsing control device is a proxy server that connects to the Internet instead of a client device,
The browsing control device according to claim 1, wherein the browser is mounted on the client device. A browsing control method executed by a browsing control device that controls browsing of a Web page using a browser,
Receiving a browsing request for the web page from the browser;
Sequentially acquiring resource data divided into data lengths of a predetermined unit constituting the Web page from the top;
For each retrieved the resource data, and storing the position in advance start tag and the end tag is encountered,
Determines whether contains viewing prohibited contents in the Web page before each cut source data,
When it is determined that the browsing prohibited content is included, the position where the end tag of the browsing prohibited content appears, the position where the start tag corresponding to the end tag appears , the start tag, and the end tag Identify each of the resource data in which
When the start tag and the end tag appear in different resource data, based on the start tag and the end tag, the range on the Web page where the browsing prohibited content is displayed (hereinafter, “ a) that the viewing prohibited ranges "specific to each before Symbol resource data,
In place of the browsing-prohibited content, the resource data in which the browsing-prohibited range is specified are replaced with the specified browsing-prohibited range so that other display contents having the same size as the browsing-prohibited content are displayed,
Along with the resource data that has not been replaced, the replaced resource data is sequentially output to the browser.
The browsing control method characterized by this. A browsing control program to be executed by a browsing control device that controls browsing of a web page using a browser,
Receiving a browsing request for the web page from the browser;
Sequentially acquiring resource data divided into data lengths of a predetermined unit constituting the Web page from the top;
For each retrieved the resource data, and storing the position in advance start tag and the end tag is encountered,
Determines whether contains viewing prohibited contents in the Web page before each cut source data,
When it is determined that the browsing prohibited content is included, the position where the end tag of the browsing prohibited content appears, the position where the start tag corresponding to the end tag appears , the start tag, and the end tag Identify each of the resource data in which
When the start tag and the end tag appear in different resource data, based on the start tag and the end tag, the range on the Web page where the browsing prohibited content is displayed (hereinafter, “ a) that the viewing prohibited ranges "specific to each before Symbol resource data,
In place of the browsing-prohibited content, the resource data in which the browsing-prohibited range is specified are replaced with the specified browsing-prohibited range so that other display contents having the same size as the browsing-prohibited content are displayed,
Along with the resource data that has not been replaced, the replaced resource data is sequentially output to the browser.
A browsing control program for causing a computer to execute processing .

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