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Document retrieval-assisting method and system for the same and document retrieval service using the same with document frequency and term frequency

  • US 5,987,460 A
  • Filed: 07/03/1997
  • Issued: 11/16/1999
  • Est. Priority Date: 07/05/1996
  • Status: Expired due to Term
First Claim
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1. A method for assisting document retrieval, comprising,detecting documents each including one or a plurality of keywords corresponding to a query as documents of retrieval results from a retrieval subject document group,detecting the document frequency of a word, representing the number of documents where the word appears in the group of the documents of retrieval results,detecting the total document frequency of a word representing the number of documents where the word appears in the whole retrieval subject document group,introducing a frequency ratio representing the ratio of the document frequency of a word to the total document frequency of the word,classifying the document frequency in a set of frequency classes as based on a given relation and assigning each word to a corresponding frequency class, depending on the document frequency of the word,extracting an appropriate number of words from each of the frequency classes in the decreasing order of frequency ratio of word as topic words, anddisplaying the extracted topic words in the form of a graph or a list.

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