Suitable processing is performed considering a case where a confirmation notification of participation in group communication or other data communication was sent, but the notification is delayed and data communication has already ended when the notification arrives at the other party.The present communication apparatus includes a communication unit 2 for transmitting/receiving data, an input unit 3, and a control unit 7 which, when start of data communication is input from said input unit 3, sends a confirmation notification of participation of the data communication to a plurality of destinations, performs data communication with destinations which reply when receiving at least one reply with respect to the confirmation notification of participation, and performs data communication after adding other destination even after the start of the data communication when receiving a reply from the other destination, wherein when ending the data communication, the control unit 7 makes the communication unit 2 transmit an end notification of the data communication to another party from which a reply for the confirmation notification of participation is not obtained among destinations to which the confirmation notification of participation was transmitted.