To improve transmission efficiency in transmitting video data through a plurality of kinds of transmission lines with different transmission rates.
When an intercom master unit 1 transmits video data to intercom secondary master units 2A, 2B and 2C, for example, video data in which each area Rij is composed of I pictures in all frames is transmitted for a transmission line Ls with a relatively high transmission rate. Video data, for example, in which the ratio of I pictures to P pictures in each area Rij of a frame is 9: 16 is transmitted only for two frames between video data in which each Rij of a frame is composed of I pictures to a transmission line Ls with a relatively low transmission rate. An appropriate data amount of video data corresponding to the respective transmission lines Ls therefore can be transmitted, so that the transmission efficiency can be improved.
COPYRIGHT: (C)2009,JPO&INPIT
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