A communication system is provided, in which the communication system includes: a part for receiving a call establishment request from a communication terminal, and sending, to the communication terminal, a call forwarding destination information including information on at least a call forwarding destination; and a part for receiving information on a call forwarding destination which is selected by a caller from the communication terminal, and allowing the communication terminal and the call forwarding destination to communicate with each other according to the information on the call forwarding destination.