PURPOSE: To perform a suitable drying treatment in accordance with items being dried by judging whether received grain is rice or wheat, on the basis of differences in a harvest time, and automatically switching equipments by items, which are different in specification between rice and wheat.

CONSTITUTION: A number of storage bins 10 are provided to be connected to dehumidifying air passages 9. When the time and date for receipt of goods into hoppers fall on a first section, that is, from August 1 to December 31 and from January 1 to May 10, of a term for use of a facility stored in a memory, rice is uniformly judged and when such time and date fall on a term from May 11 to July 31, wheat is uniformly judged, such that switching of range in a weighing equipment 3 and switching between a rice selecting route 18 and a wheat selecting route 20 are automatically effected.