INFORMATION RETRIEVAL DEVICE AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To obtain an appropriate retrieval result based on a retrieval request sentence from a user.

SOLUTION: An input processing part 31 inputs a retrieval request sentence. A syntax analyzing part 32 stores the syntax analysis result of the retrieval request sentence in a retrieval request sentence analysis result storage part 22. A primary retrieval part 33 retrieves a retrieval object sentence including an independent word included in the retrieval request sentence. A partial retrieval request generation part 34 generates the partial retrieval request sentence of the retrieval request sentence by referring to a paraphrase pattern storage part 24. A paraphrase retrieval part 35 generates the paraphrase sentence of the retrieval object sentence retrieved by referring to the paraphrase pattern storage part 24. The paraphrase retrieval part 35 determines whether or not the partial retrieval request sentence and the paraphrase sentence of the retrieval object sentence are similar. A retrieval result determination part 36 determines, when it is determined that the partial retrieval request sentence and the paraphrase sentence of the retrieval object sentence are similar, the retrieval object sentence retrieved by the primary retrieval part 33 as a retrieval result corresponding to the retrieval request sentence.

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