Patent Document ID: 6014672
Application ID: 08912367

Base Claim:
1. An information retrieval system, comprising: a history storage apparatus for storing retrieval histories each having information including a group of retrieval items, a retrieval term comprised of at least one keyword, and a retrieval result; a history storage device for storing, when retrieval of documents is performed by a first person, a retrieval history regarding said retrieval into said history storage apparatus; an input device for inputting at least one of said retrieval terms by said first person and at least one of said group of retrieval items and said retrieval terms by a second person; a history retrieval device for retrieving from within said retrieval storage apparatus, a group of retrieval histories which satisfy a designation of an inputted retrieval item, said group of retrieval histories having a keyword of said retrieval term similar to an inputted keyword of said retrieval term; a similar term retrieval device for sequencing said group of retrieval histories detected by said history retrieval device based on a similarity of retrieval terms and presenting said sequenced group of retrieval histories; and a retrieval device for retrieving documents utilizing retrieval terms of a retrieval history designated by a retrieving person from within said group of retrieval histories presented by said similar term retrieval device.

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Claim 3:
3. An information retrieval system as claimed in claim 1, wherein said similar term retrieval device calculates said similarity of retrieval terms as an inner product of weighted vectors of said keywords which coincide with each other in two retrieval terms of an object of comparison.