An electronic system includes an electronic apparatus and a portable terminal that transmits instruction signals to the electronic apparatus to allow the electronic apparatus to perform various functions. When a plurality of the portable terminals exist within a predetermined distance and transmit the respective instruction signals for allowing the electronic apparatus to perform the same function, an operation control section of the electronic apparatus performs the function indicated by the instruction signal, with higher priority, transmitted from, of the plurality of the portable terminals, the portable terminal located nearest to the electronic apparatus according to the electronic system.