Production planning system

A production planning system comprising:

• an input unit which receives production order information including an order including an ordered quantity of production of a finished product and a production date, manufacture load information representing a load for each manufacturing site, which is generated to produce a finished product, production capacity information for each date at a manufacturing site, and information on lead time up to a start date of a period type, which includes at least a first period where production capacity cannot be transferred between manufacture sites and a second period where production capacity can be transferred therebetween;
• a storage unit which stores information inputted by the input unit;
• a calculation unit which calculates, for each order, accumulation of manufacture load for a date at which the manufacture load occurs using the production order information and the manufacture load information, determines whether or not the accumulated manufacture load exceeds the production capacity at each accumulation point using the production capacity information for each manufacture site, acquires a number of products that cannot be manufactured equivalent to the manufacture load that exceed the production capacity when the accumulated manufacture load exceeds the production capacity, rewrites the production order information by deleting the number of products that cannot be manufactured from the order in the production order information and adding an order equivalent to the number of products that cannot be manufactured on or after, or on or before, a designated production date, when the accumulation point belongs to the first period, and rewrites the production capacity information in such a way that production capacity at another manufacture site, which has excess production capacity, is transferred to a manufacture site which has insufficient production capacity, when the accumulation point belongs to the second period;
• and
• an output unit which outputs the production order information and the production capacity information rewritten by the calculation unit, as a production plan and a production capacity distribution result.