An operation machine displays a received image on a monitor to enable an operator to remotely control a moving unit such as a model car and robotic arms through the image provided through a network by a camera on the unit and displayed on the monitor. Plotting of the received image on the monitor is conducted at predetermined intervals in plotting timing. The plotted image becomes a predicted image subjected to a time delay process. The moving unit carrying the camera is disposed in a remote area, and connected to a personal computer through the Internet to transmit motion pictures to the computer. At this time, a fluctuation correction is made to data of the motion pictures to provide a method of displaying a natural image. The method is employed in a moving unit's remote control system enabling an operator to enjoy a precise remote control of the unit.