A first communication device in a communication systems including the first communication device and the second communication device that performs wireless connection with the first communication device and relays communication with the first communication device, the first communication device includes a receiver configured to receive packets from the second communication device, and a transmitter configured to store reception confirmation packets corresponding to the packets in a buffer, perform transmission at least a portion of the reception confirmation packets stored in the buffer, and discard reception confirmation packets not to be transmitted in the transmission according to a discard ratio.