Abstract: In a transmitting unit, receiving stations are formed into a plurality of groups, and information associated with the right to receive a broadcasting service is rewritten in units of groups by converting the information into a packet (group information) and transmitting it together with video and audio signals. In each receiving station, group information is extracted from a received signal, and a group number included in the received packet is compared with a group number stored in a memory in advance. When they coincide with each other, information associated with the right to receive a broadcasting service is written in the memory. With this operation, information associated with the right of each receiving station to receive a broadcasting service is efficiently transmitted.