| 摘要 |
A communication device can transmit only types of data required by a receiving side, and change the type of the data during transmission. A transmitting device and a receiving device establish a communication connection via a data exchange network and perform communication. For example, when transferring sound data and moving image data collectively by MPEG-4 etc., the receiving device can request the transmitting device to transfer only the sound data or only the moving image data. At this time, the communication connection is terminated and a new communication connection is established, and if the required data is only the sound data, the data is transferred by ITU-T G.711, and if the required data is only the moving image data, the data is transferred by MPEG-2.
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