To prevent real time transmission of an image and sound from being damaged even through a state of either line is worsened in using two or more lines to dispersively transmit image and sound data.
A rate control part 116 controls operation modes of transmitting parts 111 and 112. In a dispersion mode, when the state of at least one using line between two using lines is worsened more than a fixed state, control is made over an overlapping mode. In the overlapping mode, when the entire states of the two using lines become better than the fixed state, control is made over the dispersion mode. In the dispersion mode, the transmitting parts 111 and 112 divide and transmit packets stored in a transmission queue 115. In the overlapping mode, one transmitting part having the better state of the using line between the transmitting parts 111 and 112 transmits the packets stored in the transmission queue 115, and the other transmitting part transmits a copy of the packets.
Eiji Yamada
Eiji Sasaki
Toshio Sawada
Daido Patent Office