A video data sending device comprises a receiving part for receiving sending requests from terminals, a second request section part for determining whether the sending request is for video data, a video data management part for executing sending control of the video data, a video data sending part for returning the video data to the terminal corresponding to the sending request for the video data, a data management part for executing sending control data other than video data and a data sending part for returning the data other than video data to the terminal. A data high-rate returning device comprises a data storing part for storing returning data; a receiving part for receiving a packet having a sending request from each terminal; a header information storing part for storing sending-request-packet header information and returning packet header information; a returning packet preparation part which obtains i) sending-request-packet header information from the packet, ii) returning packet header information from the header information storing part, and iii) returning data from the data storing part, and prepares a returning packet and a sending part for sending the returning packet to the terminal.