To provide an effective management system that can obtain the production management information in real-time.

The system consists of a production information storage 8, a inventory information storage 20, a main material inventory information storage 3, and a sub-materials inventory information storage 6. The production information is put in the production information storage 8 in real-time, the input and output quantity of scrap to the inventory is put in the main material inventory information storage 3 in real-time, and the sub-materials inventory quantity is put in the sub-materials inventory information storage 6 in real-time. When the production information is put in the production information storage 8, this is acquired to the inventory information storage 20 in real-time, and the production is managed by referring the production information obtained by accessing the production information storage 8, the main material inventory information storage 3, and the sub materials inventory information storage 6.