A storage (10) unloads and loads a load (3) with a transporting carriage (2). The storage is provided with a port capable of transferring said load from or to said transporting carriage; a plurality of rack portions (15) capable of accommodating or putting said load thereon; a driving device (19) capable of moving said load between said port and said plurality of rack portions, and mutually between said plurality of rack portions; and a controlling device (20) for controlling said driving device to (i) firstly move said load to an temporary rack portion for unloading, which is one of said plurality of rack portions, and (ii), after once accommodating or putting said load on said temporary rack portion, move said load to said port from said temporary rack portion, in case of moving said load from said plurality of rack portions to said port.