An information service system having user terminals and a center in which information according to a request for retrieval is provided to users at a low cost while simplifying setting of conditions for retrieval at the user terminals is simplified and maintaining real-time properties. A profile database at a center is updated using profile information transmitted by user terminals to construct an information database. Further, profile information used for retrieval is generated such that it includes information on the environment and situation around a user and information of requests and status of the user to allow proper retrieval in addition to verbal information from the user. The center searches the information database based on such profile information to provide information to the user terminal.