To provide an inventory re-reservation execution device, an inventory re-reservation execution method, and an inventory re-reservation execution program that can perform inventory re-reservation processing, which is processing for changing reservation from low-priority orders to high-priority orders based on the priority order of reservation.SOLUTION: This embodiment includes (1) referring to order data including a plurality of order detail data having a commodity code, a reserved number that is the number of commodities in a reserved state, in which inventory reservation has been completed by securing the inventory in preparation for shipment, among of the number of ordered commodities and the priority order, and releasing the reserved state of commodities specified by the commodity code in the order detail data by subtracting the reserved number until the reserved number in the order detail data becomes 0, and (2) performing the inventory reservation again for the commodity whose reserved state has been released, by allocating the total value of the reserved number having been subtracted, in the descending order from the order detail data having the higher priority, to the reserved number.SELECTED DRAWING: Figure 23
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