AUTHENTICATION APPARATUS, SERVICE PROVIDING SYSTEM, AND COMPUTER READABLE MEDIUM

摘要

An authentication apparatus includes following components. In an authentication table, first authentication information, login information, and second authentication information are associated. A communication unit communicates with another apparatus. A first login processing unit compares identification information with the first authentication information, and rewrites the login information to a logged in state and notifies the other apparatus of successful authentication when the identification information matches the first authentication information. The logout processing unit compares identification information with the first authentication information, and rewrites the login information to a logged out state when the identification information matches the first authentication information. The second login processing unit compares the identification information with the second authentication information, and notifies the other apparatus of successful authentication when the identification information matches the second authentication information and the corresponding login information indicates the logged in state.