Product management system, product management method, and non-temporary computer-readable medium for storing product management program

A product management system provided with: specific information storing means (101), a plurality of which is arranged corresponding to product display locations (111) on a product display shelf (110); a product information storing means (102) for storing product information pertaining to a product (112) displayed on the product display shelf (110); a specific information reading means (103) for transmitting location-specific information read out from the specific information storing means (101); a product presence-or-absence status deciding means (104) for deciding whether or not a product (112) is present on the product display shelf (110) in accordance with a readout signal from the specific information storing means (101) either stopping or being lower than a fixed threshold; and a product information displaying means (105) for displaying product information in accordance with the result of the decision as to the presence or absence of the product (112). This makes it possible to monitor the arrangement status of products arranged on a product display shelf at low cost.