To provide in-phase video signals from mutually separately positioned plural video cameras.

A video camera driving device 22 respectively controls synchronizing control pulse signals PH1-PH4 to be applied to the respective video cameras for generating the other video signals so that the phase of the other video signal can be matched with one of plural video signals V1-V4 inputted from plural video cameras 1-4. Thus, the deviation of phases among the respective video signals caused by the difference in the lengths of signal cables to the respective video cameras is eliminated.