The service presentation apparatus includes a member database (310) for storing the information of members registered preliminarily as users, basic authentication means (321) for authenticating official members through an open information communication line (202), and mobile communication authentication means (322) for executing the authentication by way of the mobile communication terminal (102) preliminarily registered in the member database (310), while the user side includes a service terminal (101) connected to a server (300) through the open information communication line (202). In this configuration, an individual authentication system of higher accuracy will be realized. Moreover, a highly reliable accounting system is realized by applying the individual authentication system.