An apparatus for communicating a sound wave of a human body, the apparatus comprising: a sound wave converter that converts a sound wave signal, which was transmitted from a counter apparatus through the human body into an electrical signal when the sound wave from the counter apparatus through the human body is transmitted, and an electrical signal with respect to data that are output to the counter apparatus are converted into a sound wave; a data processor receiving the converted electrical signal from the sound wave converter and transmitting the electrical signal with respect to the data to be output to the sound wave converter when the data to be output are present; and a switch connected between the sound wave converter and the data processor, the switch transmitting the converted electrical signal to the data processor and transmitting the electrical signal with respect to the data to be output to the sound wave converter.