To support a production planning adjustment by offering the adjustment of a production scheduled quantity in response to a demand state in a product group frame to the person in charge of the production planning forming/adjusting of a manufacturing industry, in the diversion of common parts between products.

A central processing unit 101 extracts a product information and subject term from a memory unit 104 while making a product group code specified by an input unit 102 to a key. The reserved residual of a received order for the planed value is extracted from the memory unit 108 of an outside sales control system 107 while making the extracted information to the key and compared with the normal stock amount of the product and the initial value of a production scheduled quantity adjustment is set. The central processing unit 101 extracts the exclusive part information of the product from the memory unit 104 and a new production scheduled quantity is set by the initial value of the production scheduled quantity and extracts the common part information of the product group from the memory unit 104 and sets the new production scheduled quantity by the adjust value of the production scheduled quantity. The set new production scheduled quantity is outputted from an indication unit 103 and printer 105.