An intangible product sales server for selling intangible products and a tangible product sales server for selling tangible products associated with the intangible products cooperate to simplify purchase procedures to be followed by users in purchasing tangible and intangible products in combination. The dividing portion 21 is formed so that first dividing surfaces located on the side of the inside cylindrical surface 14 are in contact with each other in the state of being attached to a cylinder body and a crankcase. A user interface unit 101 displays the draft policy and allows the user to check and revise it. The vessel-engaging member can also include a plurality of double bridges positioned between adjacent rows, each of the double bridges connecting a vertex of a first row with two adjacent vertices of an adjacent second row. Each hole extends through the substrate to provide fluid communication with the respective interior space. A ring may be formed which includes multiple nodes for providing a set of services in a system.