Abstract: The present invention intends to provide a system for determining prices so that the price of a poor-selling product is decreased, and the price of a well-selling product is increased, so as to ensure profit and achieve more effective inventory management. The retail price output system of the present invention comprises setting means in which a reference price of a product is set, recognition means for recognizing an order quantity from a customer for a product, pricing means for increasing or decreasing the list price of the product with respect to the reference price according to the order quantity for the product and an inventory quantity of the product, and price outputting means for outputting data for list price determined by the pricing means to a customer computer, wherein the list price of the product may be increased with respect to the reference price.