DOCUMENT RETRIEVAL DEVICE, DOCUMENT RETRIEVAL METHOD AND RECORDING MEDIUM RECORDING DOCUMENT RETRIEVAL PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a document retrieval device and a document retrieval method capable of shortening the time to be required for retrieval without reducing the retrieval accuracy of document, and to provide a recording medium on which a document retrieval program is recorded. SOLUTION: In this document retrieval method for extracting a retrieving word only when the extraction of the retrieving word from a retrieval request sentence is necessary, whether plural retrieving words are included in the retrieval request sentence or not is judged, and when the retrieval request sentence is not a sentence constituted of plural retrieving words as the result of judgment, whether the extraction of a retrieving word is necessary or not is judged by inquiring the retrieval request sentence and a word index 105. When the extraction of the retrieving word from the retrieval request sentence is unnecessary as the result of judgment, a document including the retrieval request sentence is retrieved from plural documents without extracting the retrieving word in the retrieval request sentence.