To enable an information terminal to receive data of a time period when the terminal temporarily leaves from a service area of an information distribution system if the terminal enters into the service area again, even if the terminal cannot receive the data because the terminal temporarily leaves from the service area.
When the portable information terminal enters into a radio LAN environment at a time B and transmits information that it cannot receive a broadcast wave etc. at a time A and afterwards to a cache distribution section, the cache distribution section distributes multimedia data by unicast to the portable information terminal in a mode of forwarding the data from the multimedia data corresponding to the time A in a time order. When judging that the multimedia data from the cache distribution section has caught up with the multimedia data being broadcasted or distributed in real time, the portable information terminal notifies the cache distribution section about the information of instructing completion of data transmission, completes the connection to the cache distribution section, and receives multimedia data to be distributed from a multicast/broadcast distribution section.
MIKOSHI TAKANOBU
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Masayuki Sakai
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