To set switching from the item of a program, to the item of an untime commercial to be secure by providing a transmission timing setting part setting the transmission timing of the starting of a transmission necessary item in queue sheet information and a switching means for switching and transmitting the necessary item from a master based on transmission timing.

When a CM starting pulse is emitted from a news part to a master room, a transmission unit control terminal 31 reads a program constitution file from a DB server in a transmission unit control part 5. The CM starting pulse CM-Q is transmitted from a unit control part 32 to the master room 4 at oscillation timing before prescribed time, when it becomes untime based on oscillation timing information of the CM starting pulse CM-Q and time information transmitted from the clock 33. The master room 4 starts the CM transmitter 56 and switches the switcher of the master room 4 to the CM transmitter 56 after prescribed time passes.