An object of the present invention is to provide a coordination server, a coordination system, and a coordination method capable of reflecting an intention of a providing source of a first product in search for a second product to be combined with the first product. In a preferred aspect of the present invention, a coordination server (10) is a coordination server (10) that performs coordination of a second product for a first product, and includes a coordination condition acquisition unit (25) that acquires a coordination condition that is information on a product that is combinable with the first product, which is set by a providing source of the first product, and a product group generation unit (27) that generates a first product group consisting of candidate products of the second product on the basis of the coordination conditions.