To perform management without directly joining quasi-subtle information (anonymous information) and information allowing specification of an individual (non-anonymous information) when providing various services based on the quasi-subtle information.

An information management system includes: a first means generating peculiar user identification information to the non-anonymous information received from a user, and registering it into a first storage means; a second means registering a set of the user identification information and service identification information corresponding to a service kind into a second storage means; and a third means registering a set of the service identification information and the anonymous information corresponding to the service identification information into a third storage means. The information management system further includes: a fourth means registering a set of the user identification information and peculiar identification information generated by performing identification of the user into the second storage means; and a means receiving the peculiar identification information from the user oneself, acquiring the user identification information from the second storage means, acquiring the service identification information by the user identification information, acquiring the anonymous information based on the service identification information, and providing it to the user.