A client PC receives video data distributed from a plurality of camera units and displays a plurality of video images as multiple screens on a screen of a display. At this time, the reception rate of the video data distributed from the camera unit to be controlled in pan, tilt, etc., is increased and the reception rate of the video data distributed from the different camera unit is decreased, whereby the frame rate of a split screen for displaying the video image picked up by the camera unit to be controlled is made higher than the frame rate of the different camera unit and it is made possible to visually recognize the video image clearly during the camera control.