Patent ID: 6301577
Filing Date: 2001-10-09
Classification: G06F,Y10S

Abstract:
A similar document retrieval method for retrieving similar documents of a reference document from a plurality of retrieval target documents, comprising the steps of:calculating similarities of each one of the plurality of retrieval target documents with respect to the reference document by using each one of two or more similarity calculation methods separately, the two or more similarity calculation methods including a first similarity calculation method for calculating a similarity according to a probabilistic model in which a similarity with respect to a retrieval target document is expressed by a ratio of a relevant document probability and a non-relevant document probability with respect to a retrieval request, and a second similarity calculation method according to a multinomial distribution model;retrieving the similar documents of the reference document by carrying out a discrimination analysis with respect to each one of a plurality of similarities calculated by using each one of the two or more similarity calculation methods separately.