Patent ID: 8108376

Claim:
An information recommendation device, comprising: a document input unit which inputs a document set of which each document has date and time information within a specified time period; a document analysis unit which obtains a plurality of characteristic vectors each including a plurality of keywords of vector elements by each keyword analyses of the document set or history documents including browsed documents or documents labeled by bookmark operations; a clustering unit which obtains a plurality of topic clusters and a plurality of sub-topic clusters which are each composed of documents belonging to the same topic by clustering the document set; a topic transition generation unit which generates a transition structure showing transitions of topics among the sub-topic clusters; a characteristic attribute extraction unit which extracts a characteristic attribute of frequently included keyword from each topic cluster and each sub-topic cluster; a cluster-of-interest extraction unit which extracts a cluster-of-interest equivalent to any one of the plurality of topic clusters or sub-topic clusters by similarity determination among the characteristic vectors of history documents and the characteristic vector of each document included in the document set; a recommended document extraction unit which obtains a sub-topic cluster having transition relations with the cluster-of-interest on the basis of the transition structure owned by the cluster-of-interest, and extracts a document included in the sub-topic cluster as a recommended document; and a recommended document presentation unit which presents the recommended document together with the characteristic attribute.