A capacitor upper electrode and a wiring are electrically connected to each other by using a plug and a conductive layer formed below a capacitive element without using a plug that directly connects the capacitor upper electrode to the wiring provided thereon via an interlayer insulating film therebetween. , and the polyamide resin constituting the outer layer is polyamide 11 andor polyamide 12, which satisfies a condition of >1. In the communication system, the aggregation point, which is comprised of a mobile communication terminal or the like, is provided with an ID receiver for receiving ID information from an RFID, and a cellular communication part for performing cellular communication via the cellular communication network. Multiple states, each corresponding to a predetermined range of RF input signal strength, are stored in the register.