To provide technology simplifying confirmation of location of a product and capable of easily performing location confirmation work of the product by everyone.

Regarding the respective products placed at a storage space, information for specifying a row where the respective products are placed at present and information for indicating the ranking of the product in the rank regarding the all products placed in the row are made relevant to identification information (product code) for identifying the respective products, and are memorized in a memory device 430 as production arrangement information DB437. When the product is moved from any one of the row at the storage space to the outside of the row and on contrary, when the product is moved to any rows from the outside of the row, a CPU420 of a computer body 410 replaces the ranking of the product rank in the row after the movement, and makes the information for indicating the row and the information for indicating the ranking relevant to the identification information of the product to perform renewal processing. The movement of the product between the rows can be processed as combination of the movement to the outside of the upper row and the movement from the outside of the row.