A hub and wheel equipped therewith includes a hub body and an axle rotatably receiving the hub body, the hub body being provided with at least one circumferential hub flanges which serve for accommodation and defined orientation of a multitude of spokes. The management server searches for state information of the first terminal in accordance with the requested search condition, and communicates the state information to the relay server as the device information; and in accordance with receiving the relay information from the first terminal, transmits the relay information to the second terminal. The electrolyte has high ionic conductivity comparable to that of a liquid electrolyte due to the use of the plastic crystal, and high mechanical strength comparable to that of a solid electrolyte due to the introduction of the non-crosslinked polymercrosslinked polymer structure network. The air-conditioning unit is mounted to the right side wall surface of the cab to be capable of being taken in and out from an inside and an outside of the cab. A second trigger point in a first subscriber call flow is defined.