PROBLEM TO BE SOLVED: To provide a document summarizing device for automatically summarizing a document.;SOLUTION: The document summarizing device includes a summary original document storage part 11 storing a summary original document; an extracting part 12 extracting language expressions from the summary original document; a first acquisition part 14 obtaining a plurality of summary candidates related to the extracted language expressions; a second acquisition part 15 obtaining language expressions related to the obtained summary candidates; a computing part 16 using at least the language expressions included in the summary original document and the language expressions obtained by the second obtaining part 15 to compute recall whose value is higher as the summary candidates are more related to the language expressions included in the summary original document, and precision whose value is higher as language expressions other than the language expressions included in the summary original document exist less in those related to the summary candidates; a selecting part 18 selecting a summary using the recall and precision computed for each summary candidate; and an output part 19 outputting a selected summary.;COPYRIGHT: (C)2011,JPO&INPIT
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