Importance

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Abstract

A subscriber terminal ms sends a demand including at least information for identifying the demand subscriber terminal, information for identifying the requested information, and information relating to the urgency of the requested information to the information distribution transmission center HE through a going-up line. The information distribution transmission center HE plans and transmits information requested according to the transmission schedule of the information based on the demand, and transmits the transmission schedule information in the going-down control data to the subscriber terminal which sent the demand prior to the actual transmission, and transmits the requested information according to the above-mentioned transmission schedule. The subscriber terminal ms receives and analyzes the going-down control data from the information distribution transmission center HE and is informed of the transmission schedule, and acquires the information to be transmitted based on the obtained transmission plan. The subscriber terminal stores the information in a large scale memory, and reads the information from the memory for use. After the information is read from the memory for use, an information reusing disabling unit disables the reusing of the information in such a way as to delete the corresponding information from the memory.

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First Claim