A communication system including many communication terminals and a management apparatus, which includes: a section which processes user authentication, a first information management section for managing authenticated user information in association with terminal information about the communication terminal used by the user, a second information management section for managing communication information including the user information about many users with intent to communicate with one another, and a connection control section. If the second information management section manages the communication information including the authenticated user information and if the first information management section manages the another user information as part of the communication information, the connection control section sends the terminal information about another communication terminal corresponding to the other user information, to the communication terminal identified by the terminal information in association with the authenticated user information.