Disclosed is a stocking system that effectively copes with contingencies such as a sudden increase in the number of units to be stocked or malfunctions that render a port disabled. The stocking system includes a plurality of input ports and output ports that are operated automatically, and in input/output port that is normally operated manually, but is configurable to be operated automatically in conjunction with the other input ports and output ports. The stocking system also includes a conversion controller for switching the input/output port between manual and automatic mode.
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