PURPOSE: To manage a cargo operation at a real time by providing a judging means for judging whether information read by the cargo information reading means of a fork lift coincides with cargo operation information or not and a command means for commanding a next processing operation to the fork lift on the basis of this judged result in a master station.

CONSTITUTION: Cargo operation information to be executed by a fork lift (slave station) 3 is transferred from a master station 1 to the slave station 3. In the slave station 3, a cargo operation is performed on the basis of this cargo operation information. When the fork lift 3 approaches to an object cargo B to take the cargo, the information of a recording medium 18 attached to the cargo B is read by a reading means 19. A transfer means transfers the read information to the master station 1. In this master station 1, whether the read information coincides with the cargo operation information or not is judged by a judging means. On the basis of this judged result, a next processing operation, or a correcting operation and the like for correcting the cargo picking up operation in case of an erroneous cargo picking up is commanded to the slave station 3 by a command means.