CALL SYSTEM HAVING DATA SHARING FUNCTION

PROBLEM TO BE SOLVED: To provide a technique for sharing data between user terminals and making a call by transmitting the shared data to a user terminal in association with the call.SOLUTION: Shared data is received from a terminal of a first user via a network, a telephone number for cooperation corresponding to the shared data is issued, the shared data is transmitted to a terminal of a second user, a call with a telephone of the first user is established, and a call is originated to the terminal of the second user with the telephone number for cooperation as a caller number, or a call originated from a telephone of the second user to the telephone number for cooperation is received.