Data transmission method and data trasmission system

A data transmission method for transmitting a plurality of data streams having different degrees of importance among multiple points from a plurality of terminals arranged in a network, comprising

• demultiplexing said plurality of data streams having different degrees of importance in the middle of the transmission line,
• transmitting data where continuity is regarded as important through a network having a higher quality of service and transmitting data for which discontinuity is permitted through a network having a lower quality of service, and
• combining the plurality of data transmitted through the different networks again before the data arrive at the destination terminals and transmitting the same to the terminals.

9-15. (canceled)

A data transmission system for transmitting a plurality of data streams having different degrees of importance among multiple points from a plurality of terminals arranged in a network, comprising;

• a first network having a higher quality of service,
• a second network having a lower quality of service than the first network,
• a first device for demultiplexing said plurality of data streams having different degrees of importance in the middle of the transmission line, transmitting data where continuity is regarded as important through the first network, transmitting data for which discontinuity is permitted through the second network, and a second device for combining the plurality of data transmitted through the different networks again before the data arrive at the destination terminals and transmitting the same to the terminals.