Two-way communication system, communication apparatus, and communication control method

Without changing the format of the audio encoded data, without the need for a separate transmission path or transmission quantity increase in the control information, controls the communication from a sender to a receiver using the information obtained at the receiving side. From the other side there is information to be used for controlling the communication to the own communication apparatus, the first communication device comprising a control information embedding means for embedding the control information obtained by the own communication device side to the communication data to be transmitted to the other party When using the control information sent from the first communication device, to configure the system by the second communication device includes a communication control means for controlling the communication to the first communication device side.