PURPOSE: To keep a dehumidified and dried item such as crops, for example, at a predetermined humidity during a finished drying process and to improve an operating efficiency of a dehumidifying cycle unit.

CONSTITUTION: In the case that a humidity of dried air of normal temperature to be fed into a device chamber having a dehumidified and dried item stored therein is less than a set value to stop an operation of a compressor 1 of one device 10 of a dehumidifying cycle unit and after elapsing a specified period of time, the humidity of the dried air of normal temperature is less than the set value, the compressor 1 of the device 20 is stopped and at the same time it IS more than the set value, a control device 9 performs a controlling operation in such a manner as the compressor of the device to is operated again.