To judge whether a receiver-side accepts communication or not by permitting a receiver to judge whether he accepts a communication proposal, whether he desires the increase amount of deposit amount and he denies the communication proposal, based on the deposit amount.

A transmitter 2 and a receiver 3 are connected to a communication network with a communication terminal. An exchange 5 controlling the direction of communication connecting plural channels while the multiple channels are controlled as they are exists in the network. A computer 41 having a function for storing a proper cost from the transmitter is provided in accordance with a channel manager 4 by attaching it to the channel or the exchange 5. When the transmitter 2 proposes communication to the receiver 3, how much amount the transmitter 2 pays to the receiver 3 is informed with the deposit amount in accordance with communication. The receiver 3 receives information of the deposit amount and judges whether he accepts the proposal of communication or not.