Important query extraction apparatus, important query extraction method and important query extraction program

摘要

PROBLEM TO BE SOLVED: To provide an important query extraction device capable of determining and outputting a query with a high degree of importance, in association with input queries.;SOLUTION: An important query extraction device 10 comprises: a query acquisition part 11 for acquiring queries; a query log storage part 17 for storing query logs; a first node setting part 121 for setting the acquired queries to a first node; a second node setting part 122 for extracting a query including a word included in the queries of the first node from the query logs, and setting the extracted query to a second node; a score setting part 13 for adding a directed edge between the nodes, and setting its score; and a query output part 14 for identifying an important node on the basis of the score, and outputting the query as an important query. The score setting part 13 sets a score of the directed edge going from one node to the other node, on the basis of the number of words included in the other node and a numerical value showing scarcity of words common to the nodes.;COPYRIGHT: (C)2013,JPO&INPIT