JP2003248737A - System and method for providing reliability to meta- information - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems that there is too much information on the present Internet to retrieve accurately when retrieving Web information by key words for obtaining a piece of information and that a user might not believe correctness of contents of meta-information for socially lowly recognized companies or individuals though retrieval accuracy is improved by adding meta- information to the Web information. <P>SOLUTION: A reliable electronic signature 24 of a third party 30 is added to the meta-information 23 in the Web information 21 provided by a Web site 20. Original information 22 and the meta-information 23 written in HTML language in the Web information 21 provided by the Web site 20 are read and compatibility of the read original information 22 and meta-information 23 is confirmed, and only when the compatibility is confirmed, the electric signature 24 is added to the meta-information 23 of the Web site 20. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reliability imparting system and a reliability imparting method for meta information, and particularly to We.
Regarding the meta information in the b information, the present invention relates to a reliability giving system and a reliability giving method to the meta information that makes it possible to obtain the trust of the user.

[0002]

2. Description of the Related Art When searching Web information by inputting a keyword in order to obtain certain information, an extremely large amount of information is flooded on the current Internet, and it is difficult to perform a highly accurate search. . This is because the HTML language for creating Web information is mainly composed of vocabulary (tags) for visual expression, and the content to be described is expressed in natural language, and usually a natural language is used as a keyword search. High-precision search results cannot be obtained.

For this reason, We described in the HTML language
By providing the b information with meta information that can be understood by a machine such as a search robot of a search engine and has meaning in the language to be expressed, it is possible to perform a highly accurate search. It is expected that the addition of meta information to Web information will spread in the future.

However, when the meta information is created individually, there are the following problems. (1) In the case of a provider of information and services, in the case of a company or an individual with low social awareness, it is considered that the degree of trust from the user is low, and the user believes that the content of meta information is correct You may not receive it. (2) For users of information and services It is good that highly accurate information can be obtained from meta information, but in the first place it is impossible to judge whether or not the meta information itself can be trusted. This is especially true for websites of companies with low social recognition. In addition, there is no means to confirm this even on the websites of well-known companies, because it is possible that spoofing or falsification of information is considered.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object thereof is the reliability of meta information when the Web information is searched using the meta information. The object of the present invention is to provide a reliability granting system and a reliability granting method for meta-information that guarantees.

[0006]

The present invention has been made to solve the above problems, and the system for providing reliability to meta information according to the present invention is a Web provided by a Web site.
It is a system for assigning a reliability to meta information for guaranteeing the reliability of meta information in information, and for attaching a reliable third party's electronic signature to the meta information in the web information provided by the website. It is characterized in that it is provided with an electronic signature giving means. Thereby, the information provider can add the reliability to the meta information of his / her Web information without acquiring the electronic certificate by himself / herself. Further, since the information provider does not need to own the electronic certificate by himself, he is freed from the work related to the loss or renewal of the certificate. Furthermore, the user (user) can trust the meta information based on the electronic signature of the meta information.

Further, the reliability imparting system for meta information of the present invention uses the HT in the Web information provided by the Web site.
Web information reading means for reading the original information described in the ML language and the meta information, consistency checking means for checking the consistency between the read original information and the meta information, and the original information It is characterized by further comprising means for adding the electronic signature to the meta information of the website only when the consistency with the meta information is confirmed. As a result, the electronic signature can be added after confirming whether the content of the meta information is correct, and the reliability of the meta information is significantly improved.

The meta-information reliability imparting system of the present invention periodically confirms the consistency between the original information and the meta information in the Web information and, when the consistency is confirmed, adds an electronic signature. It is characterized in that it further comprises means for executing the same. This makes it possible to guarantee the reliability of the meta information even when the Web information of the website that is the target of the electronic signature is updated.

The meta-information reliability imparting system of the present invention is characterized by further comprising means for executing the confirmation of the consistency by using a schema. As a result, it is possible to confirm the consistency by using the existing schema technology.

In the meta-information reliability imparting system of the present invention, the schema is a universal information schema including at least synonyms and synonyms, and at least famous company names, celebrity names, and It is composed of a fluid information schema including famous product names. As a result, the schema for universal information such as thesaurus, synonyms, synonyms and lexical element relations is fixed, and the schema for fluid information allows the company name, celebrity,
You can easily update fluid information such as celebrity names and product names.

The meta-information reliability giving system of the present invention is characterized in that an XML-based language is used as the schema. This makes it possible to easily create a schema by taking advantage of the features of the XML language.

Further, a method of giving reliability to meta information according to the present invention is a method of giving reliability to meta information for guaranteeing the reliability of meta information in Web information provided by a Web site. It is characterized by including a digital signature giving procedure for giving a digital signature of a reliable third party to the meta information in the Web information provided by the site. As a result, the information provider will be able to
Reliability can be given to the meta information of one's own Web information. Further, since the information provider does not need to own the electronic certificate by himself, he is freed from the work related to the loss or renewal of the certificate. Furthermore, the user (user) is
It is possible to trust the meta information based on the digital signature of the meta information.

Further, the method for providing reliability to meta information according to the present invention is the HTML in the Web information provided by the Web site.
Web information reading procedure for reading the original information described in the language and the meta information, a consistency confirmation procedure for confirming the consistency between the read original information and the meta information, and the original information and the meta information The method further includes a step of adding the electronic signature to the meta information of the website only when the consistency with the information is confirmed. As a result, the electronic signature can be added after confirming whether the content of the meta information is correct, and the reliability of the meta information is significantly improved.

Further, the method for assigning reliability to meta information according to the present invention comprises confirming the consistency between the original information and the meta information in the Web information, and adding an electronic signature when the consistency is confirmed.
It is characterized by further including a procedure to be executed periodically.
As a result, the We
Even if the b information is updated, the reliability of the meta information can be guaranteed.

The method for assigning reliability to meta information according to the present invention is characterized by further including a procedure for executing the confirmation of the consistency by using a schema. As a result, it is possible to confirm the consistency by using the existing schema technology.

Further, in the method of assigning reliability to meta information according to the present invention, the schema is a universal information schema including at least synonyms and synonyms, and at least famous company names, celebrity names, and It is characterized by further including a procedure of configuring with a fluid information schema including a famous product name. As a result, the schema for universal information such as thesaurus, synonyms, synonyms and lexical element associations is fixed, and the schema for fluid information allows the company name, celebrity name, celebrity name, product You can easily update fluid information such as names.

Further, the method for providing reliability to meta information according to the present invention is characterized in that an XML-based language is used as the schema. This makes it possible to easily create a schema by taking advantage of the features of the XML language.

Further, the computer-readable recording medium of the present invention is a computer in a system for giving a reliability to meta information for guaranteeing the reliability of meta information in Web information provided by a Web site, to a Web site. Is a computer-readable recording medium in which a program for executing an electronic signature attaching procedure for attaching an electronic signature of a reliable third party to the meta information in the Web information provided by.

Further, the computer program of the present invention provides a Web provided by a Web site to a computer in a system for giving a reliability to meta information for guaranteeing the reliability of meta information in Web information provided by a Web site.
It is a program for executing a digital signature giving procedure for giving a digital signature of a reliable third party to meta information in the information.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described with reference to the drawings.

[Conceptual explanation of the system for providing reliability to meta information] FIG. 1 is a diagram for explaining the concept of the system for providing reliability to meta information according to the present invention. In FIG. 1, We
In the web information 21 of the b site 20, in addition to image information such as GIF, original information (HT
ML) 22 and meta information 23 attached to the original information (HTML) 22. Further, the meta information 23 is provided with an electronic signature 24 of a company or organization having a high social credibility as a “trustworthy third party”. In the case of this example,
Company A 30 is a "trustworthy third party" and meta information 23
Digitally sign Further, in the A company 30, the original information (HTML) described in the HTML language in the Web information 21 is used.
It also checks the consistency between 22 and the meta information 23. When searching for information on the website 20, the user (user) 10 confirms the electronic signature 24 of the company A 30, and confirms the meta information 2
Check the reliability of 3.

The digital signature 24 is added to the meta information 23 by the "trustworthy third party". The meta information 23 is managed by the website 20 as in this example, and the "trustworthy third party" performs the electronic signature. In addition to the method of adding the signature 24, the meta information 23
It is also possible to use a method in which the server itself is managed by a server operated by a "trustworthy third party".

FIG. 2 is a diagram showing a schematic flow of a procedure for assigning a digital signature. (1) First, the information provider of the website 20 requests a trusted third party, for example, the company A 30 to give a signature (arrow line a). (2) The company A 30 confirms the content of the meta information 23 of the website 20 (arrowed line b). That is, the consistency between the original information 22 and the meta information 23 is checked. (3) If the result of the integrity check is “OK (correct)”, the electronic signature 24 is created by encryption using the private key paired with the public key in the electronic certificate 3, and the website 20
Is added to the meta information of (arrowed line c).

[Functional Configuration Example of Reliability Improving System] FIG. 3 is a block diagram showing an example functional configuration of the reliability imparting system, and shows only a portion directly related to the present invention.

In FIG. 3, the server 31 of the reliability providing system includes the following functions (means). The Web information reading unit 51 is a unit for downloading Web information from the Web site 20 requesting the addition of the electronic signature. The encryption means 52 is a means for obtaining a hash value from the original information (HTML) 22 and the meta information 23 read from the website 20 and encrypting the obtained hash value with the secret key to create the electronic signature 24. The electronic signature giving means 53 is means for transmitting the electronic signature data created by the encryption means 52 to the website 20. The consistency confirmation unit 54 is a unit for confirming the consistency between the original information (HTML) 22 read from the website 20 and the meta information 23 by the schema 63. The public key sending means 55 receives a request from the user's personal computer (also simply referred to as “PC”) 11,
It is a means for sending a public key for decrypting the electronic signature 24.

The following information is recorded in the database 60. The website information 61 is information that records web information of a website that has contracted to give an electronic signature. The attached electronic signature information 62 is information recording the information of the electronic signature attached to the meta information of the website. The schema 63 is information that stores a schema for confirming the consistency between the original information (HTML) and the meta information.
The schema 63 includes a universal information schema 63a and a fluid information schema 63b. The consistency check history information 64 records history information of the consistency check process of the meta information of the website 20.

[Example of digital signature creation method and decryption]
FIG. 4 is a diagram for explaining an example of a method of creating a digital signature. In FIG. 4, the electronic signature is created as follows. The server 31 of the reliability providing system shown in FIG. 4 is an example of the server of the company A 30 as a “trustworthy third party”. (1) Step S1 The server 31 of the company A 30, which is a reliable third party, uses We
The original information (HTML) 22 and the meta information 23 are read from the b site 20 via the Internet 1. (2) Step S2 A hash value is obtained from the read original information (HTML) 22 and meta information 23. (3) Step S3 The obtained hash value is encrypted with the private key of Company A 30 to create a digital signature. (4) Step S4 The server 31 transmits the created electronic signature to the website 20, and the website 20 receives the received electronic signature 24.
Is attached to Web information.

FIG. 5 is a diagram for explaining the decryption and confirmation operation of the electronic signature. The example shown in FIG. 5 is an example in which the “trustworthy third party” is company A 30. In FIG. 5, the electronic signature is decrypted as follows.

(1) Step S11 The user 10 can access the website 2 from the user's PC 11.
0 to access the original information (HTML) that is Web information
22, the meta information 23, and the electronic signature 24 are read. (2) Step S12 Further, the public key 4 of the company A 30 is read from the electronic certificate 3 of the certificate authority 2 and the electronic signature 24
Using the public key 4 of company A. Company A 30
Public key 4 may be read from the server of company A 30. (3) Step S13 The decrypted hash value is obtained. (4) Step S14 On the other hand, a hash value is obtained from the read original information (HTML) 22 and meta information 23. (5) Step S15 The hash value obtained by the operation is compared with the decrypted hash value, and if they match, it is determined that the data has not been tampered with and is correct data.

[Checking Consistency of Meta Information and Original Information (HTML)] FIG. 6 is a diagram for explaining checking consistency of the meta information and the original information (HTML). In the reliability providing system of the present invention, the content of the meta information 23 is checked and the original information (H
Check if there is a difference between the TML) 22 and the meta information 23,
If there is a mismatch or an error, the website 2
Warn 0. Software for confirming the consistency is set using the schema 63. Further, as the schema, a schema using a language based on XML (eXtensible Markup Language) can be used. Further, the schema 63 is divided into two and set as follows. · Schema 63a for universal information Thesauri for each genre (thesauru
s: search terminology), synonyms, synonyms, schemas for universal information such as relationships between vocabulary elements, and sets the importance of each element. -Schema 63b for fluid information Set fluid information such as company name, celebrity name, celebrity name, and product name.

The consistency of the information in each tag in the meta information 23 is checked as follows.・ <Title> Magician ABCD </ Title> is the title “Magician ABC” in the original information (HTML) 22.
Since it matches "D", it becomes "OK (correct)" (arrowed line a).・ <Summary> The boy of the wizard ... </ Outline> is a long sentence in the original information (HTML) 22 "The bad wizard ABCD at the age of 2 ..." Although it is an analysis and the accuracy drops, it is set to "OK" (arrowed line b).・ <Author> K. J. Smith </ author> is the original information (HT
Since it matches the author “K. Smith” in ML) 22, it is “OK” (arrowed line c).・ <Atmosphere> Very high </ atmosphere> is the original information (HTM
L) The “book” in 22 does not have the element “atmospheric pressure”, so it is determined as “NG (error)” (arrowed line d).・ <Issuer> △△ Company </ Issuer> is the original information (HTM
L) Since it does not match the "○○ publication" in 22, "NG"
(Wrong) ”(arrowed line e, arrowed line f).・ <Price> 1,800 yen </ Price> is the original information (HTM
Although the price is not described in L) 22, since it is an important item, "warning" is output (arrowed line g).

Further, in the reliability giving system of the present invention,
Information on each information provider and the website 20 (URL, update frequency, summary of provided information, etc.) is made into a database, and the presence or absence of update of information on the website and the consistency are regularly checked. If the information is updated, the integrity is checked, and if the information is consistent, the electronic signature is added again. In the case of inconsistency, the website 20 is notified of the modification of the meta information (or the original information), and when the consistency check is “OK”, the signature is re-signed.

FIG. 7 is a diagram for explaining the above-described regular consistency confirmation operation. In FIG. 7, the confirmation of the consistency is performed as follows. In this example, the server of the reliability granting system is a "trustworthy third party".
Is an example of the server of the company A 30. (1) The website 20 is equipped with a change monitoring tool 25, and regularly verifies and confirms whether or not the web information of the website 20 is changed (arrow line a). (2) When there is a change in the web information of the website 20, the server 31 of the company A 30, which is a reliable third party, is notified. The server 31 of the A company 30 downloads the Web information 21 (arrowed line b). Server 31 of Company A 30
Then, the vocabulary element of the Web information is analyzed by the schema 63, and the consistency confirmation processing is performed. (3) If the check result of the consistency is “OK”, the signature is re-signed. If the consistency check result is "NG (wrong)", W
A request for correction of the meta information 23 is sent to the information provider of the eb site 20.

[Information User Access Flow] FIG.
We of the information user in the reliability giving system of the present invention
It is a figure for demonstrating the flow of access to a b site. (1) The user inputs a keyword from the user's PC 11 using a search engine compatible with meta information (arrow line a). (2) UR of the website 20 where the keyword is hit
The list of L is displayed on the PC 11 (arrowed line b). (3) The user specifies the URL to be referred (arrowed line c). (4) The user is the web information 21 of the website 20,
Also, the electronic signature 24 is loaded, and the public key 4 is loaded from the certificate authority 2 (or the server of company A, which is a trusted third party) (arrowed line d, arrowed line e). Then, the electronic signature 24 is verified. The verification result of the electronic signature 24 is “O
In the case of “K”, it is assumed that there is no alteration of data,
The Web information 21 is referenced (arrowed line f). Note that the meta-information compatible search engine is a search engine for searching for meta-information added to Web information, such as attribute information defined by XML tags.

[Configuration Example of Server of Reliability Improving System]
Further, FIG. 9 is a block diagram showing a configuration example of a server of the reliability providing system, and shows only a part directly related to the present invention.

In FIG. 9, 32 is a server of the reliability providing system, 41 is a communication interface for connecting the Internet 1 and the server 32, 42 is a control unit for controlling the entire server, and 70 is a processing program unit. The database 60 is the same as that shown in FIG.

Further, the processing program section 70 includes the following processing sections. The Web information reading processing unit 71 is a processing unit for downloading Web information from the Web site 20 requesting the addition of the electronic signature. The encryption processing unit 72 is a processing unit that obtains a hash value from the original information (HTML) 22 and the meta information 23 read from the website 20 and encrypts the obtained hash value with a secret key to create an electronic signature 24. is there. The electronic signature assignment processing unit 73 is a processing unit for transmitting the electronic signature data created by the encryption processing unit 72 to the website 20. The consistency confirmation processing unit 74 is a processing unit for confirming the consistency between the original information (HTML) 22 read from the website 20 and the meta information 23 by the schema 63. The public key sending processing unit 75 is a processing unit for sending a public key for decrypting the electronic signature 24 in response to a request from the user's PC 11.

The processing program unit 70 may be realized by dedicated hardware, and the processing program unit 70 is constituted by a general-purpose information processing device such as a memory and a CPU (central processing unit). , A program (not shown) for realizing the function of this processing unit
May be realized by loading the program into a memory and executing the program. Also, this server
It is assumed that an input device, a display device, etc. (none of which is displayed) are connected as peripheral devices. Here, the input device refers to an input device such as a keyboard and a mouse. The display device refers to a CRT (Cathode Ray Tube), a liquid crystal display device, or the like.

Further, by recording a program for realizing the function of the processing unit 70 in FIG. 9 in a computer-readable recording medium, and by causing the computer system to read and execute the program recorded in this recording medium. Processing necessary for the system for providing reliability to meta information of the present invention may be performed. The “computer system” mentioned here includes an OS and hardware such as peripheral devices.

The "computer-readable recording medium" means a flexible disk, a magneto-optical disk,
It refers to a portable medium such as a ROM or a CD-ROM, or a storage device such as a hard disk built in a computer system. Furthermore, "computer-readable recording medium"
Is a communication line that holds a program dynamically for a short period of time, such as a communication line for transmitting the program through a network such as the Internet or a communication line such as a telephone line.
(Transmission medium or transmission wave), such as a volatile memory inside a computer system that serves as a server or a client in that case, that holds a program for a certain period of time is also included. Further, the above-mentioned program may be a program for realizing a part of the above-mentioned functions, and a program that can realize the above-mentioned functions in combination with a program already recorded in a computer system, that is, a so-called difference file (difference file). Program).

Although the embodiment of the present invention has been described above, the system for providing reliability to meta information of the present invention is not limited to the above-mentioned illustrated example, and does not depart from the gist of the present invention. Of course, various changes can be made within.

[0042]

As described above, in the reliability imparting system and the reliability imparting method for meta information of the present invention, in order to guarantee the reliability of the meta information accompanying the Web information provided by the Web site. Since an electronic signature of a reliable third party is added to the meta information, the information provider can add the reliability to the meta information of its Web information without acquiring the electronic certificate by itself. can do. Further, since the information provider does not need to own the electronic certificate by himself, he is freed from the work related to the loss or renewal of the certificate. Furthermore, the user (user)
Can trust the meta information based on the digital signature of the meta information.

Further, in the reliability imparting system and the reliability imparting method for meta information of the present invention, the original information described in the HTML language and the meta information in the Web information provided by the Web site are read and read. The consistency between the original information and the meta information is confirmed, and the digital signature is added only when the consistency between the original information and the meta information is confirmed. Since the electronic signature is added after confirmation, the reliability of the meta information is significantly improved.

Further, in the reliability imparting system and the reliability imparting method for meta information of the present invention, the consistency of the Web information is regularly confirmed, and the electronic signature is imparted only when it is judged to be correct. As a result, the reliability of the meta information can be assured even when the Web information of the Web site targeted for the electronic signature is updated.

Further, in the reliability imparting system and the reliability imparting method for meta information of the present invention, the consistency of the original information (HTML) in the Web information and the meta information is confirmed by using the schema. Therefore, this makes it possible to confirm the consistency by using the existing schema technology.

Further, in the reliability imparting system and the reliability imparting method for meta-information of the present invention, the schema is composed of a universal information schema and a fluid information schema. As a result, the schema for universal information such as thesaurus, synonyms, synonyms and lexical element associations is fixed, and the schema for fluid information allows the company name, celebrity name, celebrity name, product You can easily update fluid information such as names.

In addition, in the reliability providing system and the reliability providing method for meta information of the present invention, an XML-based language is used as a schema. Therefore, the features of the XML language can be utilized and the schema can be utilized. Will be easier to create.

[Brief description of drawings]

FIG. 1 is a diagram for explaining the concept of a system for providing reliability to meta information according to the present invention.

FIG. 2 is a diagram showing a schematic flow of a procedure for assigning an electronic signature.

FIG. 3 is a block diagram showing a functional configuration example of a reliability providing system.

FIG. 4 is a diagram illustrating an example of a method of creating a digital signature.

FIG. 5 is a diagram for explaining an operation of decrypting and confirming an electronic signature.

FIG. 6 is a diagram for explaining checking of consistency between meta information and original information (HTML).

FIG. 7 is a diagram for explaining a regular consistency confirmation operation.

FIG. 8 is a diagram for explaining a flow of access to a website of an information user.

FIG. 9 is a block diagram showing a configuration example of a server of the reliability providing system.

[Explanation of symbols]

1 Internet 2 Certificate Authority 3 electronic certificates 4 Public key 10 users 11 User's personal computer (PC) 20 websites 21 Web information 22 original information 23 Meta Information 24 electronic signature 25 Change monitoring tool 30 Reliable third party (Company A) 31 and 32 Servers of reliability granting system 51 Web information reading means 52 encryption means 53 Electronic signature giving means 54 Consistency confirmation means 55 Public Key Delivery Means 60 databases 61 Website information 62 Assigned electronic signature information 63 schema 63a Universal information schema 63b Fluid information schema 64 Consistency confirmation history information

Claims (14)

[Claims] 1. A system for assigning a reliability to meta information for guaranteeing the reliability of meta information in Web information provided by a website, wherein the meta information in the Web information provided by a website is trusted. A system for providing reliability to meta information, characterized by comprising an electronic signature giving means for giving a third party's electronic signature. 2. A Web information reading means for reading the original information described in the HTML language in the Web information provided by the website and the meta information, and the consistency between the read original information and the meta information. It further comprises a consistency confirmation means for confirming, and means for adding the electronic signature to the meta information of the website only when the consistency between the original information and the meta information is confirmed. Claim 1
A system for providing reliability to the meta information described in. 3. The system further comprises means for periodically checking the consistency between the original information and the meta information in the Web information, and adding a digital signature when the consistency is confirmed. The system for providing reliability to meta information according to claim 2. 4. The reliability imparting system for meta information according to claim 2 or 3, further comprising means for executing the confirmation of the consistency by using a schema. 5. The schema includes a universal information schema including at least synonyms and synonyms, and a fluid information schema including at least famous company names, celebrity names, and famous product names. The system for providing reliability to meta information according to claim 4, characterized in that 6. The XML-based language is used as the schema, according to claim 4 or 5.
A system for providing reliability to the meta information described in. 7. A method for providing reliability to meta information for guaranteeing the reliability of meta information in Web information provided by a website, wherein the meta information in the Web information provided by the website is trusted. A method for assigning reliability to meta information, which includes a digital signature assigning procedure for assigning a digital signature of a third party. 8. A Web information reading procedure for reading the original information described in the HTML language and the meta information in the Web information provided by the website, and the consistency between the read original information and the meta information. It further includes a consistency confirmation procedure for confirming, and a procedure for adding the electronic signature to the meta information of the website only when the consistency between the original information and the meta information is confirmed. The method for providing reliability to meta information according to claim 7. 9. The method further comprises the steps of periodically confirming the consistency between the original information and the meta information in the Web information, and adding a digital signature when the consistency is confirmed. The method for providing reliability to meta information according to claim 8. 10. The method according to claim 8, further comprising a step of executing the confirmation of the consistency by using a schema.
Alternatively, the method for providing reliability to meta information according to claim 9. 11. The schema is a universal information schema including at least synonyms and synonyms, and a fluid information schema including at least famous company names, celebrity names, and famous product names. 11. The method for providing reliability to meta information according to claim 10, further comprising the step of: 12. The method for adding reliability to meta information according to claim 10, wherein an XML-based language is used as the schema. 13. A computer in a system for giving a reliability to meta information for guaranteeing the reliability of meta information in Web information provided by a website, to meta information in Web information provided by a website, A computer-readable recording medium recording a program for executing a digital signature giving procedure for giving a digital signature of a trusted third party. 14. A computer in a system for providing reliability to meta information for guaranteeing the reliability of meta information in Web information provided by a website, to meta information in Web information provided by a website, A program for executing the digital signature giving procedure for giving a digital signature of a trusted third party.