trend information retrieval apparatus, trend information retrieval method, and a program

摘要

Disclosed is a retrieval device (100) which retrieves statistical trend information in relation to a topic specified by a user. An expansion query generation unit (21) generates an expanded query by adding a trend information element to a condition input by a user. A trend information retrieval unit (22) retrieves external data (5) using the query generated by the expansion query generation unit (21). A trend information determination unit (23) determines whether or not statistical trend information satisfying a condition input on the basis of an appearance pattern of the trend information element is included in text retrieved by the trend information retrieval unit (22).