| 摘要 |
PROBLEM TO BE SOLVED: To provide a data distribution system to provide a variety of materials in a broadcast mode to a user having a satellite communication terminal capable of receiving a signal from a communication satellite. SOLUTION: The system has a data (distribution) center connected to a satellite earth station in order to transmit the broadcast signal to the communication satellite, and the data center publishes contents of accumulated information on an Internet homepage(HP) for presenting them to the user for retrieval. The user determine data to be obtained by retrieving them on the HP, and transmit a request signal to the data center via the Internet on the ground or the communication satellite. The data center returns a reservation signal including a group address and a distribution estimated time to the demander via the satellite. A user terminal receives data to which the group address given to a reserved time of day is attached, decodes them by a key separately given from the data center, then accumulate them in a memory. |
