A system usable as one of a power transmitting system and a power receiving system based on an electric field coupling method, the system comprising: a first device; and a second device; wherein: each of the first device and the second device is a power transmitting device in the power transmitting system, or each of the first device and the second device is a power receiving device in the power receiving system; both of the first and second devices are capable of transmitting power to a same power receiving device, or both of the first and second devices are capable of receiving power from a same power transmitting device; the first device includes: a first electrode pair, and a first matching circuit connected with the first electrode pair; the second device includes: a second electrode pair, and a second matching circuit connected with the second electrode pair; each of the first electrode pair and the second electrode pair is a power transmitting electrode pair, or each of the first electrode pair and the second electrode pair is a power receiving electrode pair; a parasitic capacitance of the first electrode pair is smaller than a parasitic capacitance of the second electrode pair; and the first matching circuit has a shunt capacitance larger than a shunt capacitance of the second matching circuit, in order to provide desired power transmission characteristics. a first device; and a second device; wherein: each of the first device and the second device is a power transmitting device in the power transmitting system, or each of the first device and the second device is a power receiving device in the power receiving system; both of the first and second devices are capable of transmitting power to a same power receiving device, or both of the first and second devices are capable of receiving power from a same power transmitting device; the first device includes: a first electrode pair, and a first matching circuit connected with the first electrode pair; the second device includes: a second electrode pair, and a second matching circuit connected with the second electrode pair; each of the first electrode pair and the second electrode pair is a power transmitting electrode pair, or each of the first electrode pair and the second electrode pair is a power receiving electrode pair; a parasitic capacitance of the first electrode pair is smaller than a parasitic capacitance of the second electrode pair; and the first matching circuit has a shunt capacitance larger than a shunt capacitance of the second matching circuit, in order to provide desired power transmission characteristics. each of the first device and the second device is a power transmitting device in the power transmitting system, or each of the first device and the second device is a power receiving device in the power receiving system; both of the first and second devices are capable of transmitting power to a same power receiving device, or both of the first and second devices are capable of receiving power from a same power transmitting device; the first device includes: a first electrode pair, and a first matching circuit connected with the first electrode pair; the second device includes: a second electrode pair, and a second matching circuit connected with the second electrode pair; a first electrode pair, and a first matching circuit connected with the first electrode pair; the second device includes: a second electrode pair, and a second matching circuit connected with the second electrode pair; a second electrode pair, and a second matching circuit connected with the second electrode pair; each of the first electrode pair and the second electrode pair is a power transmitting electrode pair, or each of the first electrode pair and the second electrode pair is a power receiving electrode pair; a parasitic capacitance of the first electrode pair is smaller than a parasitic capacitance of the second electrode pair; and the first matching circuit has a shunt capacitance larger than a shunt capacitance of the second matching circuit, in order to provide desired power transmission characteristics.