Patent ID: 8103560

Claim:
An inventory management system implemented by an information processing apparatus, the system comprising: an ordering-required-quantity-data storing unit that stores an ordering required-quantity of a product previously forecast, the ordering required-quantity incorporating a market demand forecasting value and a safety inventory quantity; an order-entry-actual-achievement-data storing unit that stores an actual order quantity of a product for which order entries have been placed; a market-demand-forecasting-value calculation unit that calculates a market demand forecasting value based on the actual order quantity stored in the order-entry-actual-achievement-data storing unit; a correction quantity calculation unit that acquires the actual order quantity from the order-entry-actual-achievement-data storing unit, acquires the ordering required-quantity from the ordering-required-quantity-data storing unit, and calculates a correction quantity for a safety inventory quantity of the product based on an error rate, wherein the error rate indicates an error of the actual order quantity to the ordering required-quantity thereof and becomes negative when the ordering required-quantity is larger than the actual order quantity, and positive when the ordering required-quantity is smaller than the actual order quantity; a reference safety inventory quantity calculation unit that calculates a reference safety inventory quantity based on market demand forecasting of the product; a determined safety inventory quantity calculation unit that calculates a determined safety inventory quantity, which is a value obtained by adding the correction quantity calculated by the correction quantity calculation unit to the reference safety inventory quantity calculated by the reference safety inventory quantity calculation unit; and an ordering required-quantity calculation unit that calculates the market demand forecasting value, which is a value obtained by adding the determined safety inventory quantity calculated by the determined safety inventory quantity calculation unit to the market demand forecasting value calculated by the market-demand-forecasting-value calculation unit, wherein the correction quantity calculation unit calculates the error rate for each office which supplies the product based on an error in the actual order quantity of the product to a past ordering required-quantity thereof in a predetermined period, the correction quantity based on the error rate and a market demand forecasting value in a supply lead time of the product, and the correction quantity based on a unit price of the product.