Abstract: A receiving Bluetooth module has a buffer for sequentially storing packets received from a Bluetooth module of an audio sever. After a predetermined number of received packets is stored in the buffer, the received packets are sequentially read out from the butter while subsequently received packets are being storing in the buffer. Then, the read packets are decoded to perform the reproduction of the real-time data. In this way, a voice is output from a headphone. When the number of packets in the buffer is zero, the reproduction of the real-time data is stopped, and then subsequently received packets are discarded. In addition, the intensity of received radio waves is monitored, and the operation of storing the received data packets in the buffer is resumed when the intensity of the radio waves exceeds a predetermined level at a predetermined time.