CITATION DETECTION DEVICE, DEVICE AND METHOD FOR CREATING ORIGINAL DOCUMENT DATABASE, PROGRAM AND RECORDING MEDIUM

摘要

PPROBLEM TO BE SOLVED: To accurately detect whether an input document includes a citation composed of two or more continuous sentences without altering a character string in the other document, with less computational complexity. PSOLUTION: An original document DB 4 is prepared by dividing each document in original documents that are candidates of citation source into partial character strings that can be units of citation, creating summaries of the partial character strings, arranging each summary in the order of appearance of the partial character strings to form a digest of the document, and registering, for each partial character string, the digest with a document ID thereof so as to be capable of longest prefix match. A digest creation means 5 converts an input document to a digest similar to the above, and a citation detection means 6 retrieves the original document DB 4 using the digest of the input document as a key by longest prefix match, and outputs, if there is a document in which the number of summaries continuously matching is a predetermined threshold or more, its document ID. PCOPYRIGHT: (C)2010,JPO&INPIT