To provide an inexpensive optimization support system for an enterprise cooperation model generally applicable to various business and capable of efficiently optimizing a large-scale enterprise cooperation model without requiring any highly dedicated knowledge.

This system is provided with a means 1 describing/designing a business process according to the enterprise cooperation model subjected to the optimization, a means 2 inputting preparation/production/distribution/sales restricting conditions, resources, and cost data of a product and an intermediate product, and a means 3 performing P1 optimization on the basis of the business process while taking the restricting conditions, the resources, and the cost data into consideration.