To perform bidirectional communication limited to a fixed region by providing a means that stores a file, selecting a channel that transmits broadcasting data from plural empty channels by a channel selecting means, and transmitting the file as broadcasting data in the region.

When in transmission, a microprocessor 202 displays a selection menu through an image decoder 207, selects a transmission channel by the operation of a station selection switch 105 and sets a broadcaster ID. A file list in a file system 206 is displayed on an LCD 102 of a display screen, and a transmitter selects a broadcasting file from the lift by using the switch 105. The microprocessor 202 performs broadcasting processing through a tuner 201. When in receiving, the broadcaster ID is acquired and is set to a memory RAM 203, when a channel is determined. An HTML browser that is stored in the memory of the RAM 203 or a ROM 204 is started by the control of the microprocessor 202, and a sentence is displayed.