To solve the problem that reproduction points are not connected seamlessly when a picture to be transmitted is changed from the output of a reproduction picture of an active system to the output of a reproduction picture of a standby system in case of fault occurrence, in a transmission system having a dual system having the active system and standby system.

In the transmission system, a system changer 302 has a comparing function for reproduction points of the active system and standby system to delay the output of a frame synchronizer of the standby system when the reproduction point of the standby system is early, or to skip the reproduction of a standby system picture reproducer 101-2 when the reproduction point of the standby system is delayed.