To present a combination of products/items to be developed suitable for developing a system by setting an arbitrary priority.

An automatic demand generating section 110 determines security function requirements which meets customer request 101 based on an industry standard/codes table 131. An automatic product selection section 120 determines a product group corresponding to the security function requirements of the customer request 101 based on a product/library table 132. An automatic product selection section 120 determines candidate groups of combination of corresponding products based on the product group corresponding the customer request 101. An automatic product selection section 120 calculates the entire number of security function requirements for each combination of corresponding products based on the product/library table 132. An automatic product selection section 120 generates a product combination list 121 indicating combination candidates of corresponding products which has a larger entire number of security function requirements (an example of the priority) and outputs the generated product combination list 121.