| 摘要 |
A server proxy ( 12 ), which is arranged between a distribution server ( 11 ) and a router ( 13 a), adds quality information to a packet ( 19 a) from the distribution server ( 11 ) to output a packet ( 19 b). A plurality of reception terminal proxies ( 17 a-17n), which are arranged immediately before respective reception terminals ( 18 a-18n), remove the quality information from the packet ( 19 b) distributed via a network ( 14 ) and routers ( 13 b-13m), and distribute only necessary information to the respective reception terminals ( 18 ). Each reception terminal proxy ( 17 ) which includes a quality information acquisition unit ( 17 A) acquires the quality information to transmit, from a quality information calculation/transmission unit ( 17 B), the quality information ( 51 ) to an accumulation server ( 15 ). The accumulation server ( 15 ) saves, in a quality information database, packet quality information ( 52 ) for each reception terminal ( 18 ).
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