To provide an information retrieval and providing device and method for providing coherent information by a simple operation, and providing not only core information but also peripheral information.

A keyword retrieval part 16 retrieves a new database 15 according to a retrieval keyword and a retrieval sub-keyword registered in a retrieval keyword database 17 notifies a Web page preparing part 18 of the pertinent news, retrieves the retrieval keyword database 17 on the basis of a keyword extracted by a keyword extracting part 14, and notifies the Web page preparing part 18 of the user of pertinent user registration data. The Web page preparing part 18 updates the Web page exclusive for the notified user, and transmits a notification mail to the user.