Abstract: To realize a system which can efficiently use a satellite communications or broadcasting channel and simply realize modes suitable for applications such as shopping, wherein the system also has a large-scale subscription. A system was configured wherein for information sent from a satellite the header of a packet is deemed as an information identifier based on the content of the information, or alternatively information having a receiving terminal identifier provided beforehand to the receiving terminal is combined with information having an information identifier based on the content of the information.