A sound communication system in which sound information is transmitted and received via an internet protocol network, has a terminal of a transmission side having an encoding unit which encodes the sound information at a predetermined section of a frame unit, and a packetizing unit which packetizes the sound data of the frame unit which is encoded in the encoding unit while thinning out a predetermined frame, and a terminal of a reception side having a receiving unit which receives the encoded sound data which is packetized, and a decoding unit which decodes the encoded sound data which is received by the receiving unit while complementing the encoded sound data which is received at the predetermined frame unit.