JP2008130034A - Automatic extracting device and method of different representation of famous person - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic extracting device and method of different presentation of a person's name. <P>SOLUTION: The device comprises a morpheme analyzing part for acquiring data about a person's name from a database including person's name information on a network, retrieving a condition with a person's name and a prescribed keyword and morphologically analyzing an obtained retrieval result in an upper rank, and a different representation candidate extracting part for selecting a word with high frequency which appears disproportionately in a particular document among morphologically analyzed words, calculating the strength of cooccurrence between the selected word and the person's name and extracting a word with strong cooccurrence as a different representation candidate. The method corresponding to the device is provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an automatic extraction device for different expressions of celebrities. More specifically, the present invention relates to an apparatus, a method, and a program for automatically extracting another expression (aka, popular name, nickname, etc.) of a famous person.

With the spread of the Internet and improvements in search technology, it has become possible to easily obtain large amounts of data simply by entering keywords into a search engine. However, when there are words having the same meaning but different notations in keyword search, there is a problem that the user needs to change or narrow down keywords. For this problem, the server now supports search using a thesaurus (a dictionary that classifies and organizes words by upper / lower relationship, partial / whole relationship, synonym relationship, synonym relationship, etc.). Has been done. However, the thesaurus for personal names does not exist or is poor. Therefore, in Non-Patent Document 1, a corpus (a large amount of language data that can be searched by a computer) is collected from the Web for personal names, and aliases such as nicknames and nicknames of personal names are extracted from the corpus. A method for constructing a thesaurus for personal names has been proposed.
Shusuke Furusawa, Kazuhiro Morita, Masao Hamada, Junichi Aoe: Automatic Extraction Method of Personal Names, The 11th Annual Conference of the Association for Natural Language Processing (NLP2005), pages 695-698, March 2005

  According to “automatic extraction of another expression including a person's name” described in Non-Patent Document 1, a corpus is acquired using a search engine using an input person's name as a keyword. Next, by using character type cutting, only the kanji, numbers, roman letters, and katakana are left, and candidates for different expressions of personal names are extracted. Furthermore, a phrase including the input person name is acquired from the extracted phrase, morphological analysis is performed on the acquired phrase, and morphemes that are not necessary for another notation of the person name are deleted. Then, this unnecessary morpheme is defined as an unnecessary word, and another notation of the personal name is extracted by deleting it.

  Similarly, according to “automatic extraction of another expression that does not include a person name” described in Non-Patent Document 1, a search engine is used to obtain a corpus using “that + input person name” as a keyword for the input person name. Next, all 15 characters before “Koto + person name” in the acquired corpus are acquired. Further, the obtained 15-character actual notation is registered in the database, and the appearance frequencies of the matching parts are totaled by backward matching. Then, candidates for different representations of personal names are obtained from the database and the appearance frequency, and inappropriate words are deleted in character units.

  However, in the method described in Non-Patent Document 1, it is necessary to perform processing separately for “automatic extraction of another expression including a person name” and “automatic extraction of another expression including no person name”. In "automatic extraction of different expressions including", matching (comparison) between the input person name and the character string is required. With such a method, it is not possible to extract another expression that does not include the entire entered person name. In addition, in the method of “automatic extraction of another expression that does not include a person name”, an individual rule such as “Koto + person name” is required, and another notation that does not conform to such a rule cannot be extracted.

  In view of the above-described problems, the present invention does not require matching between an inputted person name and a character string, and automatically extracts another name of a person name without applying individual rules such as “Koto + Person Name”. It is an object of the present invention to provide a new apparatus and method that can be used.

  The present invention provides the following solutions.

(1) A device that automatically extracts different expressions of celebrities,
Retrieve data about names from a database containing name information on the network,
A morphological analysis unit that performs a condition search with a person name and a predetermined keyword, and morphologically analyzes the obtained high-order search results;
From the words analyzed by morpheme, select a word that frequently appears in a specific document, calculate the strength of co-occurrence between the selected word and the person name, and separate the strong co-occurrence word A separate expression candidate extraction unit for extracting as an expression candidate;
A device comprising:

  According to such a configuration, the apparatus acquires data (for example, a web page) related to a person name from a database (for example, a highly reliable database such as Wikipedia) including person name information on the Internet or the like. The morpheme analysis unit provided in the above performs, for example, a condition search for a person name obtained from a celebrity list or the like with a predetermined keyword, and morphological analysis is performed on the obtained upper search result. Here, the predetermined keyword is a plurality of predetermined phrases that are clues for extracting another expression of a person's name. The condition search is, for example, an AND condition of a person name and the above keyword. Furthermore, the separate expression extraction unit of the present apparatus selects a word that frequently appears in a specific document from words analyzed by morpheme, and the co-occurrence strength (co-occurrence hit) between the selected word and the person's name. : A measure for measuring the strength of the relationship), and the words having strong co-occurrence are extracted as alternative expression candidates.

  By doing this, the information from the existing database on the Internet that is updated daily is indexed and made efficient, and a search is performed using a name list and keywords that are registered in advance using this information. Since Up To Date information that appears at the top can be used as original data (content), reliability, fashionability, and extensibility can be simultaneously incorporated. In addition, by combining TF * IDF, which is a well-known technique, with the calculation of co-occurrence strength, it is possible to extract words or phrases that have a strong relationship with a person name as alternative expression candidates.

  (2) The predetermined keywords are “name”, “real name”, “oldness”, “alias”, “another expression”, “nominal name”, “nickname”, “nickname”, “common name”, “common name”. The device according to (1), including at least one of “nickname”, “abbreviation”, “stage name”, “artist name”, “pen name”, and “young name”.

  According to such a configuration, it is possible to increase the efficiency of extracting another expression by registering a large number of the above keywords that serve as clues for extracting another expression of a person name. Of course, this keyword may be updated based on an empirical rule.

  (3) The apparatus according to (1) or (2), wherein the strength of the co-occurrence is calculated using a Simpson coefficient.

  According to such a configuration, the frequency of occurrence of the co-occurrence strength (co-occurrence hit) by the calculation of the Simpson coefficient, which is a well-known technique, and biased to a specific document is TF * IDF (Term The frequency can be specifically obtained using a Frequency-Inverse Document Frequency) value. Here, as described later, the Simpson coefficient is a scale in which the co-occurrence is determined to be stronger as the value is larger in the range of the score from 0 to 1.

  (4) The image processing apparatus further includes a determination unit that rank-displays the extracted alternative expression candidates by the separate expression candidate extraction unit and causes a device administrator to determine the validity of the separate expression, and determines the separate expression according to the determination. The apparatus according to (3), which is registered in a separate expression database.

  According to such a configuration, the apparatus includes a means for allowing the word extracted by the apparatus as another expression candidate to be further judged by a human eye such as an apparatus administrator, so that only a more reliable different expression is registered in the database. can do.

  (5) The device according to (4), wherein the ranking display is displayed by sorting the Simpson coefficient and the TF * IDF value in descending order.

  According to such a configuration, in the ranking display, the result of sorting both the Simpson coefficient and the TF * IDF value is displayed, so that the device administrator can make a judgment based on the characteristics of both when selecting another expression candidate. Can do.

(6) A method for automatically extracting different expressions of celebrities,
A condition search with a person name and a predetermined keyword;
Morphological analysis of the upper search results obtained by the conditional search;
Selecting a word with a high frequency of occurrence in a specific document from the words subjected to morphological analysis, and calculating the co-occurrence strength of the selected word and the person name;
Extracting the co-occurrence words as alternative expression candidates;
Including methods.

  According to such a configuration, since the upper search result obtained by performing a condition search with a user name and a predetermined keyword entered arbitrarily from the user or the system side is used as a data source, only data frequently used for searching on the Internet is targeted. In addition, morphological analysis is performed on the search results as preprocessing, and TF * IDF, which is a well-known technique, is combined with the calculation of co-occurrence strength to efficiently extract alternative expressions for personal names. Can do.

  (7) The predetermined keywords are “name”, “real name”, “oldness”, “alias”, “another expression”, “name”, “nickname”, “nickname”, “common name”, “common name”. , “Nickname”, “abbreviation”, “stage name”, “artist name”, “pen name”, “young name”.

  According to such a configuration, as in (2), it is possible to improve the efficiency of extraction of another expression by registering a large number of the above-mentioned keywords that serve as clues for extracting another expression of a person's name. Can do.

  (8) The method according to (6) or (7), wherein the strength of the co-occurrence is calculated using a Simpson coefficient, and the frequency of appearing biased in the specific document is calculated using a TF * IDF value.

  According to such a configuration, as in (3), the frequency of occurrence of the co-occurrence strength (co-occurrence hit) by the calculation of the Simpson coefficient, which is a known technique, and biased to a specific document is TF * IDF (Term Frequency-Inverse Document Frequency) value can be specifically obtained.

  (9) The method further includes a step of ranking and displaying the extracted different expression candidates, causing a device administrator to determine the validity of the different expression, and registering the different expression in a different expression database according to the determination. The method according to 8).

  According to such a configuration, as in (4), since it is provided with means for allowing the words extracted as alternative expression candidates to be further determined by the eyes of an administrator, only more reliable alternative expressions are registered in the database. be able to.

  (10) The method according to (9), wherein the ranking display is sorted and displayed in descending order of the Simpson coefficient and the TF * IDF value.

  According to such a configuration, similarly to (5), the result of sorting both the Simpson coefficient and the TF * IDF value is displayed in the ranking display, so that when selecting another expression candidate, it is based on the characteristics of both. Judgment can be made.

(11) A computer program for automatically extracting another expression of a celebrity,
A condition search with a person name and a predetermined keyword;
Morphological analysis of the upper search results obtained by the conditional search;
Selecting a word having a high TF * IDF value from the words subjected to morphological analysis, and calculating the strength of co-occurrence of the selected word and the person name;
Extracting the co-occurrence words as alternative expression candidates;
A computer program that causes a computer to execute.

  According to such a configuration, it is possible to provide a computer program that causes a computer to execute a function having the same operational effects as (5).

  According to the present invention, based on Up To Date information sources on the Internet, an individual rule such as “Koto + Person Name” is applied without using matching between the input person name and the searched character string. In addition, it is possible to provide an apparatus, a method, and the like that can automatically extract a new alias notation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, these are merely examples, and the technical scope of the present invention is not limited thereto.

  FIG. 1 is a diagram showing an outline of functional blocks of another expression extraction device 10 according to an example of a preferred embodiment of the present invention.

  As shown in the figure, the separate expression extraction apparatus 10 mainly communicates with a server 30 having various databases via the Internet 40, and collects a large amount of data relating to personal names, and indexes the collected data. The index creation unit 12 stored in the index DB 20, the morpheme analysis unit 13 that decomposes the indexed data into morphemes (the smallest meaningful character string unit), and extracts another candidate expression of a person name from the morpheme-analyzed data Another expression candidate extraction unit 14, a determination unit 15 that allows human confirmation from another expression candidate, and another expression DB 21 that stores a number of confirmed alias expressions. The separate expression DB 21 generated here functions as a personal name expression dictionary and can be one of the tools for improving the efficiency of Japanese information processing. Moreover, you may provide the database access part 19 which performs access control to index DB20 and separate expression DB21. In addition, the apparatus includes a communication unit 18, an input unit 16, and a display unit 17, which are used for general information processing apparatuses, and thus description thereof is omitted.

  FIG. 2 is a diagram showing an outline of the processing flow of the separate expression extraction apparatus 10 according to an example of the preferred embodiment of the present invention.

  First, in step S1, data related to a person's name is downloaded and indexed from a database having a lot of reliable information such as Wikipedia (an encyclopedia that can be freely posted and edited). The indexing here may be any method. As for Wikipedia, for example, [http: // www. nature. com / nature / journal / V438 / n7070 / full / 438900a. Refer to reports such as html, online, search October 31, 2006].

  Next, in step S2, the name of a person who wants to search for another expression, etc. (for example, a phrase in which keywords such as “Hideyoshi Toyotomi” and “alias” are combined with an AND condition) are input. For example, such search keywords are "name", "real name", "oldness", "alias", "another expression", "call name", "nickname", "nickname", "common name", "common name", It is a clue to search for aliases such as “nickname”, “abbreviation”, “stage name”, “artist name”, “pen name”, “young name”, and the index DB 20 is configured using these keywords as index labels. May be. By doing so, search efficiency can be expected.

  Next, in step S3, morphological analysis is performed on sentences in the top N pages of the search results. For the morphological analysis, a known technique such as “tea bowl” may be used. Here, the morphological analysis may remove character strings that are unlikely to be used as alternative expressions of personal names, such as particles and conjunctions.

  Next, in step S4, another expression candidate is extracted from the top N pages subjected to morphological analysis using the TF * IDF value. The TF * IDF value is typically calculated by the following equation (1), and takes a higher score as it appears more biased to a specific page.

  Further, the strength of the relationship between the alternative expression candidate extracted by TF * IDF and the aforementioned person name is calculated (step S5). As a measure for measuring the strength of the relationship, there is a method for obtaining mutual information, but here, a calculation method using Simpson coefficients is used. The Simpson coefficient is a measure for measuring the strength of co-occurrence of two words, and is calculated by the following equation (2). The Simpson coefficient takes a value in the range of score 0 to 1, and the larger the value, the stronger the co-occurrence.

  Finally, in step S6, the strongly related word (word with strong co-occurrence) obtained in step S5 is extracted as another expression candidate.

  FIG. 3 is a diagram showing the concept of co-occurrence hits in another expression candidate extraction method according to a preferred embodiment of the present invention.

  In this figure, as an example of a celebrity, attention is given to “Hideyoshi Toyotomi” in the celebrity list 25. The top N morphological-analyzed vocabulary list 35 extracted by the above-mentioned method includes alias candidates such as “Yoshiro Kinoshita”, “Hiyoshimaru”, “Hideyoshi Hideshiba”, but “Yoshitsune”, “ Many vocabularies that are related but not different expressions, such as “Sekigahara”, may also be included. The words that are likely to co-occur with the celebrity list's name “Hideyoshi Toyotomi” are used for identification by the aforementioned co-occurrence hit calculation. In this example, 47a, 47b, and 47c are determined to be adopted as separate expressions, and 48 is determined not to be adopted as another expression in the final judgment by human eyes.

  FIG. 4 is a diagram illustrating an example of a result that is simply sorted in descending order by the Simpson coefficient.

  As shown in the figure, words that are not likely to be related as another expression of a person's name ("Toshiie Maeda's real daughter", "Yoshitsune") are extracted only by the magnitude of the Simpson coefficient. The problem with the Simpson coefficient is that low-frequency words often have noise with few co-occurrence, but the Simpson coefficient tends to be high. For example, if the number of single hits of “Hideyoshi Toyotomi” is 999,000 and the number of single hits of “Maeda Toshiie's Real Daughter” is 5, that is, | Hideyoshi Toyotomi | = 999,000 | | = 5, | Toyotomi Hideyoshi, Maeda Toshiie's real daughter | = 5, R (Toyotomi Hideyoshi, Maeda Toshiie's real daughter) = 5 / min (999,000,5) = 5/5 = 1. 00. In other words, the simpson coefficient of “Maeda Toshiie's real daughter”, who seems to be unrelated, may be high.

  In order to deal with such problems, Matsuo et al. Have proposed a solution based on threshold k (Toyo Matsuo, Hironori Tomobe, Koichi Hashida, Mitsuru Ishizuka, Utilization of Human Network Extraction Technology in Event Space Support, 18th (See National Congress of Population Intelligence Society, 3C1-04, June 2004). In this method, words whose single hit count is less than the threshold k are excluded. That is, Equation 2 is modified and defined as Equation 3 below.

  However, there are still problems that cannot be solved by the threshold value k. For example, when | Toyotomi Hideyoshi | = 999,000, | , 821,000) = 95,400 / 821,000 = 0.116. Here, when “Sekigahara” is to be excluded from the alternative expression candidates, k = 821,000. However, when k = 821,000, most words are excluded from the candidates.

  On the other hand, in the method of the present invention using TF * IDF, words having a low TF * IDF are excluded. For example, even in the same co-occurrence hit, TF = 1, IDF = 4.369, TF * IDF = 4.369 of “Sekigahara”, TF = 42, IDF = 5.681 of “Kinoshita Fujiyoshi”, Assuming that TF * IDF = 238.602, words having a relatively low TF * IDF value can be selected as words that are unlikely to be related.

  FIG. 5 is a diagram illustrating extraction results of alternative expression candidates using Simpson coefficients and TF * IDF values. In this figure, in addition to k = 30 as a threshold, TF * IDF threshold = 5 is used, a Simpson coefficient is used as a first descending sort key, and TF * IDF is used as a second descending sort key.

  As can be seen from this result, it is confirmed that the method of combining the Simpson coefficient of the present invention and TF * IDF is effective in extracting another candidate for the personal name.

  FIG. 6 is a diagram showing an outline of the processing flow of another expression extraction system according to another example of the preferred embodiment of the present invention.

  6 is basically the same as the apparatus 10 described with reference to FIGS. 1 and 2, but in this system, the crawler unit 11, the index creation unit 12, another expression candidate extraction unit Each unit such as 14 may exist as a separate device. FIG. 6 shows the entire system including these devices. In this system, as already described, the crawler unit 11 acquires the URL list 31 including links to useful sites such as Wikipedia (step S11), and requests content from the Internet 40 to the URL. (Step S12). And the information (content 50) regarding a person's name is acquired (step S13). The obtained content 50 is transferred to the index creation unit 12 (step S14), and after being indexed (step S15), the separate expression candidate extraction unit 14 extracts the separate expression candidate 51 (step S16). This alternative expression candidate 51 is confirmed to be the final different expression 52 of the person's name by determination by the human eye (step S17), and is registered in the separate expression DB 21. The contents of the registered separate expression DB 21 may be viewed externally like a dictionary (step S18). Note that the function of each device is the same as that described above, so the details are omitted.

  FIG. 7 is a diagram showing an outline of the processing flow of another expression extraction method according to still another example of the preferred embodiment of the present invention.

  As shown, personal name data is input to the search engine 11 a from the celebrity list 25, and a search result page 50 a is obtained from the Internet 40. In this method, the crawler unit 11, the index creation unit 12, the index DB 20, and the like as shown in FIG. 1 are not necessarily provided. It may be considered that the search engine 11a performs these functions.

  The search result page is subjected to score calculation including the following steps. Each step is the same as the step in FIG. 2, but in step S3, the top N morphological analyzes of the search results are performed. Next, in step S4, a TF * IDF value is obtained, and in step S5, a co-occurrence hit is calculated. Step S7 is a new step not shown in FIG. 2, and filtering or ranking display is performed on the alternative expression candidate 51. In this display, the Simpson coefficients may be sorted and displayed, or the Simpson coefficients and TD * IDF values may be displayed side by side. These displays can be used to determine different expressions by human eyes.

[Hardware configuration of separate expression extraction device]
FIG. 8 is a diagram illustrating an example of a hardware configuration of the separate expression extraction device 10 according to an example of the preferred embodiment of the present invention described in FIG. 1. The separate expression extraction apparatus 10 includes a central processing unit (CPU) 1010 (a plurality of CPUs such as a CPU 1012 may be added in a multiprocessor configuration) constituting a control unit 101, a bus line 1005, a communication I / F 1040, a main memory 1050. , A BIOS (Basic Input Output System) 1060, a USB port 1090, an I / O controller 1070, and input means such as a keyboard and mouse 1100 and a display device 1022.

  Storage means such as a tape drive 1072, a hard disk 1074, an optical disk drive 1076, and a semiconductor memory 1078 can be connected to the I / O controller 1070.

  The BIOS 1060 stores a boot program that is executed by the CPU 1010 when the separate expression extraction apparatus 10 is started up, a program that depends on the hardware of the separate expression extraction apparatus 10, and the like.

  The hard disk 1074 constituting the storage unit 107 stores various programs for the separate expression extraction apparatus 10 to function as a server and programs for executing the functions of the present invention, and various databases can be configured as necessary. is there.

  As the optical disc drive 1076, for example, a DVD-ROM drive, a CD-ROM drive, a DVD-RAM drive, or a CD-RAM drive can be used. In this case, the optical disk 1077 corresponding to each drive is used. A program or data can be read from the optical disk 1077 by the optical disk drive 1076 and provided to the main memory 1050 or the hard disk 1074 via the I / O controller 1070. Similarly, the tape medium 1071 corresponding to the tape drive 1072 can be used mainly for backup.

  The program provided to the separate expression extraction apparatus 10 is provided by being stored in a recording medium such as the hard disk 1074, the optical disk 1077, or a memory card. This program may be read from the recording medium via the I / O controller 1070 or downloaded via the communication I / F 1040 to be installed and executed in the separate expression extraction apparatus 10.

  The aforementioned program may be stored in an internal or external storage medium. Here, as a storage medium constituting the storage unit 107, in addition to the hard disk 1074, the optical disk 1077, or the memory card, a magneto-optical recording medium such as an MD or a tape medium can be used. Further, a storage device such as a hard disk 1074 or an optical disk library provided in a server system connected to a dedicated communication line or the Internet may be used as a recording medium, and the program may be provided to the separate expression extraction apparatus 10 via the communication line. .

  Here, the display device 1022 displays a screen for accepting data input to the user, or displays a screen of a calculation processing result by the separate expression extraction device 10, and includes a cathode ray tube display device (CRT), a liquid crystal display. Includes a display device such as a device (LCD).

  Here, the input means accepts input by the user, and may be constituted by a keyboard and a mouse 1100 or the like.

  The communication I / F 1040 is a network adapter for enabling the separate expression extraction apparatus 10 to be connected to a terminal via a dedicated network or a public network. The communication I / F 1040 may include a modem, a cable modem, and an Ethernet (registered trademark) adapter.

  In the above example, the separate expression extraction apparatus 10 has been mainly described. However, the functions described above can be realized by installing a program in a computer and operating the computer as a server apparatus. Therefore, the functions realized by the server described as an embodiment in the present invention can be realized by executing the above-described method by the computer, or by introducing the above-mentioned program into the computer and executing it. It is.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to embodiment mentioned above. The effects described in the embodiments of the present invention are only the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

It is a figure which shows the outline of the functional block of the separate expression extraction apparatus 10 which concerns on an example of suitable embodiment of this invention. It is a figure which shows the outline of the processing flow of the separate expression extraction apparatus 10 which concerns on an example of suitable embodiment of this invention. It is a figure which shows the concept of the co-occurrence hit of the extraction method of another expression candidate which concerns on suitable embodiment of this invention. It is a figure which shows the example of the result sorted in descending order by the Simpson coefficient. It is a figure which shows the extraction result of another expression candidate using a Simpson coefficient and TF * IDF value. It is a figure which shows the outline of the processing flow of the another expression extraction system which concerns on another example of suitable embodiment of this invention. It is a figure which shows the outline of the processing flow of the another expression extraction method which concerns on another example of suitable embodiment of this invention. It is a figure which shows an example of the hardware constitutions of the separate expression extraction apparatus 10 which concerns on an example of suitable embodiment of this invention demonstrated in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Separate expression extraction apparatus 11 Crawler part 11a Search engine 12 Index creation part 13 Morphological analysis part 14 Different expression candidate extraction part 15 Judgment part 16 Input part 17 Display part 18 Communication part 19 Database access part 20 Index DB
21 Separate expression DB
25 Celebrity list 30 Server 31 URL list 35 Top N morphologically analyzed vocabulary list 40 Internet 47a, 47b, 47c Adopted list 48 Unaccepted list 50 Content 50a Search result page 51 Alternative expression candidate 52 Alternative expression 101 Control unit 107 Storage Part

Claims (11)

A device that automatically extracts different expressions of celebrities,
Retrieve data about names from a database containing name information on the network,
A morphological analysis unit that performs a condition search with a person name and a predetermined keyword, and morphologically analyzes the obtained high-order search results;
From the words analyzed by morpheme, select a word that frequently appears in a specific document, calculate the strength of co-occurrence between the selected word and the person name, and separate the strong co-occurrence word A separate expression candidate extraction unit for extracting as an expression candidate;
A device comprising:   The predetermined keywords are “name”, “real name”, “oldness”, “alias”, “another expression”, “name”, “nickname”, “nickname”, “common name”, “common name”, “nickname” The apparatus according to claim 1, comprising at least one of “”, “abbreviation”, “stage name”, “artist name”, “pen name”, and “young name”.   The apparatus according to claim 1, wherein the co-occurrence strength is calculated using a Simpson coefficient, and the frequency of occurrence of bias in the specific document is calculated using a TF * IDF value.   The apparatus further comprises a determination unit that rank-displays the different expression candidates extracted by the different expression candidate extraction unit and causes a device administrator to determine the validity of the different expression, and determines the different expression as a different expression database according to the determination. The apparatus according to claim 3, wherein the apparatus registers.   The apparatus according to claim 4, wherein the ranking display is sorted and displayed in descending order of the Simpson coefficient and TF * IDF value. A method for automatically extracting different expressions of celebrities,
A condition search on the network by a person's name and a predetermined keyword;
Morphological analysis of the upper search results obtained by the conditional search;
Selecting a word with a high frequency of occurrence in a specific document from the words subjected to morphological analysis, and calculating the co-occurrence strength of the selected word and the person name;
Extracting the co-occurrence words as alternative expression candidates;
Including methods.   The predetermined keywords are “name”, “real name”, “oldness”, “alias”, “another expression”, “name”, “nickname”, “nickname”, “common name”, “common name”, “nickname” , “Abbreviation”, “stage name”, “artist name”, “pen name”, “young name”.   The method according to claim 6 or 7, wherein the strength of the co-occurrence is calculated using a Simpson coefficient, and the frequency of occurrence of bias in the specific document is calculated using a TF * IDF value.   9. The method according to claim 8, further comprising a step of ranking the extracted different expression candidates, causing a device administrator to determine the validity of the different expression, and registering the different expression in a different expression database according to the determination. The method described.   The method according to claim 9, wherein the ranking display is sorted and displayed in descending order of the Simpson coefficient and the TF * IDF value. A computer program that automatically extracts different expressions of celebrities,
A condition search on the network by a person's name and a predetermined keyword;
Morphological analysis of the upper search results obtained by the conditional search;
Selecting a word having a high TF * IDF value from the words subjected to morphological analysis, and calculating the strength of co-occurrence of the selected word and the person name;
Extracting the co-occurrence words as alternative expression candidates;
A computer program that causes a computer to execute.

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