To properly make a plan or make correctable a plan by providing a retrieval output means or the like which obtains and outputs at least one of the judgement that a higher order can be executed by retrieval from the higher order to lower order and the judgement of the influence of order delay on a product by the retrieval from the lower order to the higher order.

At the time of judging whether or not a production plan order (A001) can be executed, a record corded to a demand given the same number as the order (A001) is retrieved. Then, a retrieval output means repeatedly retrieves the relation between the demand corresponding to a specific order of cording information generated by a cording means and an order related thereto to obtain and output one of the judgement of the execution possibility of the higher order by retrieval from the higher order to the lower order and the judgement of the influence of order delay on a product by retrieval from the lower order to the higher order.