To provide a method and a system for supporting creation of improved structure capable of reducing a parts cost of a product, an assembly cost and a loss accompanying defective assembly.

A part composing the product is analyzed as to a function, an attribute, an assembly operation and an assembly attribute, an element required to be improved is extracted based on a difference between the parts costs/assembly costs due to the presence of those elements, and an improvement guide line for structure capable of reducing the member cost and the assembly cost is generated based on a similar improvement example in the past.