To supply energy without degrading working efficiency of a carriage.

When an AGV 2 arrives at a supply necessity judging point 3a provided in the vicinity of an energy supply point 5, based on the fixed data of a host computer 1 (the energy remaining quantity of the AGV 2, the used state or the reserved state of the energy supply point 5 and the like) necessity of execution of energy supply is judged, an energy supply command is given to the AGV 2 according to the judged result. Hence even during operation following a carry command, energy is supplied if possible, load of the energy supply point 5 is dispersed as much as possible, the overhead for energy supply is reduced to improve the rate of operation of the AGV 2.