PURPOSE: To accurately recognize the work vehicle in a work area at all times and freely makes the work vehicle in the work area for running and working according to a specific work plan.

CONSTITUTION: The work vehicle 2 equipped with a measurement pole 7, a radio receiver 9, and an operation part controlled with a control signal that the radio receiver receives is arranged in the work area 1, a position measuring instrument 13 with an automatic tracking mechanism is installed at a position measurement point where the work area can be seen, and a measurement pole 14 is installed at a reference point which can be seen from the position measuring instrument 13, and the positions of the work vehicle 2 relative to the position measurement point and reference point are continuously measured by the position measuring instrument 13, and the measurement data are sent out to a controller, which compares the measurement data with previously stored work plan data and outputs the control signal, which is transmitted by a radio transmitter to the radio receiver of the work vehicle, so that the work vehicle is run for the operation according to the operation plan.