To assure the benefit of constructing a partnership for the order- reception and execution of a project among a plurality of transversely cooperative enterprises.

A server 16 is provided with: an enterprise information DB 28 for storing information including reliability indicating the reliability of enterprises seeking the construction of a partnership; an enterprise category judging part 30 for judging the category of the enterprises for executing the scheduled project according to the contents of the project; and an enterprise selecting part 36 for extracting candidate enterprises for constructing the partnership for each category and selecting the enterprises for constructing the partnership according to the reliability of the enterprises from the candidate enterprises for each category.