An automated ordering system in a retail shop adapted to automatically order goods. In the system, a demand amount in the future is first supposed on the basis of an average of the past demands, the supposed future demand amount is corrected by the variable condition used to change the demand amount to predict a future demand amount, and the order amount is determined pursuant to a calculation formula on the basis of the predictive future demand amount and the stock volume of goods. Goods tend to be stocked in surplus or out of stock are diagnosed on the basis of the change of the past demands and the worker determines the amount of orders in respect to these goods.