PURPOSE: To manage plural washers and driers with one control tower by sending a return signal representing a running state from each slave machine to a master machine, and outputting a work completion signal from the master machine to each slave machine after the completion of the prescribed process is confirmed while a prescribed process is executed by receiving feed from the master machine.

CONSTITUTION: A state where plural clothing dries 4 are connected to a control box 1 as the slave machines can be displayed by key tops 9b representing set numbers on buttons, and a run signal line 16 (return signal line from each slave machine to the control box 1 that is the master machine) generated by the relay of each slave machine, etc., is installed. Each slave machine is equipped with a means to send the return signal representing the running state to the master machine when the prescribed process is executed by receiving the feed from the master machine, and the master machine is equipped with a means to output the work completion signal to each slave machine after confirming the completion of the prescribed process by receiving the return signal from each slave machine. In such a way, since a time from water supply to the completion of washing is set uniformly, it is possible to solve a problem such as insufficient cleaning due to large amount of washing.