A call system 5 includes a setup server 1 provided on a communication network which controls communication between a calling terminal 2 and a called terminal 3 and a charging server 4 which charges the calling terminal 2. The setup server 1 includes a setup unit 21 which sets advertisement-related CAT media in a signal addressed to the calling terminal 2 during a call between the calling terminal 2 and the called terminal 3 and a measurement unit 22 which measures a start time and an end time of the setting of the CAT media in the signal addressed to the calling terminal 2. The calling terminal 2 includes a play unit which plays the CAT media. The charging server 4 includes a charge unit which charges the calling terminal 2 on the basis of the measured times.