Dialog system, redundant message elimination method, and redundant message elimination program

摘要

There are provided an answer evaluation means 501 that finds an answer content indicating how much an expression which would be an answer for a query is contained in a series of user's comments for the query contained in a set of queries which are response message candidate for a user's comment as characters string information indicating user's comment contents and which are character string information in a question form, and a query ranking means 502 that ranks each query in ascending order of answer content based on the answer content of each query in a user's comment found by the answer evaluation means 501.