Communication system and transfer device

摘要

A video data providing unit ( 10 ) connects to a restricted access providing-side VPN ( 20 ). A streaming server ( 60 ) connects to a restricted access transmitting-side VPN ( 50 ). A router ( 40 ) determines whether or not transmitting-side data such as request data or instruction data received via the transmitting-side VPN ( 50 ) is data that has been transmitted from the streaming server ( 60 ), and whether or not providing-side data such as video data received via the providing-side VPN ( 20 ) is data that has been transmitted from the information providing unit ( 10 ). The router 40 then transfers the transmitting-side data and providing-side data based on those determination results.