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Document processing apparatus, word extracting apparatus, word extracting method and storage medium for storing word extracting program

  • US 5,905,980 A
  • Filed: 09/18/1997
  • Issued: 05/18/1999
  • Est. Priority Date: 10/31/1996
  • Status: Expired due to Term
First Claim
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1. A document processing apparatus comprising:

  • a document information storing element for storing information including a document identifier and a plurality of words included in a document for each of all documents;

    a retrieval condition inputting element for inputting a retrieval condition for the documents to be retrieved;

    a retrieving element for retrieving specific documents matching the retrieval condition by using the information;

    a keyword designating element for designating an arbitrary word in the documents as an associate-word-searching word and designating other words as candidates to be associated;

    a simultaneous appearance probability calculating element for calculating a probability that the associate-word-searching word and one of the candidates are simultaneously included in any of the documents retrieved by the retrieving element for each of the candidates;

    a first independent appearance probability calculating element for calculating a first probability that the associate-word-searching word is included in any of all documents;

    a second independent appearance probability calculating element for calculating a second probability that one of the candidates is included in any of all documents for each of the candidates;

    a calculating element for calculating the sum of product of the first and second probabilities for each of the candidates; and

    an associate word extracting element for calculating a ratio of the probability calculated by the simultaneous appearance probability calculating element to the sum or product calculated by the calculating element for each of the candidates and extracting a word according to the ratio of each of the candidates.

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