To allow the user to instantaneously discriminate of which channel a transmission equipment is in charge in the broadcast system having plural broadcast channels.

A state display device 2 is connected to source transmitters 1a-1i respectively and arranged just on the relating transmitter. Outputs of the source transmitters 1a-1i are fed to a switcher 3 and outputted to plural channels CH-CH6. The source transmitters 1a-1i and the switcher 3 are controlled based on a time table with respect to each channel stored in a DB7. In the case of transmission, a channel number being a connection destination of the transmitter connecting to the display device 2 is displayed on the display device 2 together with a state of the transmitter connected to the display device 2. The number is displayed attended with revision of the connection destination of the transmitter based on the time table. Since the channel number is displayed on the display device 2 arranged just on the transmitter, even in the broadcast system with plural channels, the user momentarily grasps the channel in charge by the transmitter.