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Question answering system, data search method, and computer program

  • US 7,526,474 B2
  • Filed: 09/22/2005
  • Issued: 04/28/2009
  • Est. Priority Date: 03/14/2005
  • Status: Expired due to Fees
First Claim
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1. A question answering system comprising:

  • a processor;

    an input device for receiving an input question sentence;

    a question-sentence analysis unit controlled by the processor which is configured to extract a keyword to be applied to a search process from the input question sentence;

    a search unit controlled by the processor which is configured to execute the search process using the extracted keyword;

    an answer-candidate extraction unit controlled by the processor which is configured to extract answer candidates for the input question sentence based on a search result of the search unit;

    a check-expression generation unit controlled by the processor which is configured to analyze a structure of the input question sentence, an analysis result of the check-expression generation unit including at least detection of a subject of the input question sentence, and to generate a check expression in which (i) at least the subject of the input question sentence of the analysis result of the check-expression generation unit and (ii) each of the answer candidates extracted by the answer-candidate extraction unit are concatenated;

    a check-expression search unit controlled by the processor which is configured to execute a search process based on the check expression generated by the check-expression generation unit; and

    an answer-candidate correction unit controlled by the processor which is configured to select an output answer to the input question from among answer the candidates based on a search result of the check-expression search unit; and

    an output device for displaying or storing the output answer.

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