INFORMATION RETRIEVAL DEVICE, INFORMATION RETRIEVAL SYSTEM, INFORMATION RETRIEVAL METHOD AND COMPUTER PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide an information retrieval device capable of displaying advertisement information matched to a user's interest.

SOLUTION: A database update part 34 of an information retrieval server 3 updates a retrieval frequency conformed to a received retrieval keyword of received retrieval history information including user identification information, and an advertisement information retrieval part 35 reads, from the received retrieval history information including the user identification information, a retrieval keyword conformed to a retrieval frequency satisfying a predetermined condition, retrieves a registration keyword equal to the retrieval keyword from an advertisement information database 312, and reads advertisement information conformed to the retrieved registration keyword. An information transmitting and receiving part 32 transmits acquired retrieval result information and the read advertisement information to a user terminal 21.

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