Abstract: Since only users registered in a chatting service are subject of friends on the chatting service, unregistered users cannot become friends. A server apparatus controls a message exchanged between registered users who are registered in a chatting service, and controls a message exchanged between a registered user and an unregistered user. Also, the server apparatus manages a friend list of the registered user, and recommends other user to be added to the friend list with respect to the registered user. Also, the server apparatus determines other user to be recommended to the registered user by using a predetermined condition set according to the presence or absence of registration in the chatting service.

Abstract: A music distribution server according to an embodiment provides a service in which users can easily enjoy digital contents. The server may include an information storage unit storing various tables and data bases, a playback transmission unit transmitting, in response to playback requests, music data to a terminal device in a streaming method, and a purchase transmission unit transmitting, in response to a purchase request, the music data to the terminal device in a downloading method, a ticket possession status update unit updating a possession status of virtual tickets used for playback of the music data possessed by users, a ticket providing unit providing the virtual tickets to users, a comment management unit managing users' comments on music pieces, a recommendation management unit managing recommendation of music pieces by one user to other users, and a ticket offer management unit offering the virtual tickets from one user to other users.

Abstract: A music distribution server according to an embodiment provides a service in which users can easily enjoy digital contents. The server may include an information storage unit storing various tables and data bases, a playback transmission unit transmitting, in response to playback requests, music data to a terminal device in a streaming method, and a purchase transmission unit transmitting, in response to a purchase request, the music data to the terminal device in a downloading method, a ticket possession status update unit updating a possession status of virtual tickets used for playback of the music data possessed by users, a ticket providing unit providing the virtual tickets to users, a comment management unit managing users' comments on music pieces, a recommendation management unit managing recommendation of music pieces by one user to other users, and a ticket offer management unit offering the virtual tickets from one user to other users.

Abstract: A server according to an embodiment allows a user to more comfortably enjoy communication with other users.

Abstract: Since only users registered in a chatting service are subject of friends on the chatting service, unregistered users cannot become friends. A server apparatus controls a message exchanged between registered users who are registered in a chatting service, and controls a message exchanged between a registered user and an unregistered user. Also, the server apparatus manages a friend list of the registered user, and recommends other user to be added to the friend list with respect to the registered user. Also, the server apparatus determines other user to be recommended to the registered user by using a predetermined condition set according to the presence or absence of registration in the chatting service.