In a service providing system, a live-distribution service for
live-distributing contents supplied according to a reservation, and a
chat service for providing the use of a chat space corresponding to the
reservation for the live distribution are provided. When a personal
computer and another personal computer use the live-distribution service
and the chat service, they need to be authenticated by a streaming server
and a communication server. For authentication, both the streaming server
and the communication server use a shared password registered in a
reservation data base when the live distribution is reserved.