1. A robot cleaner system, comprising: an external recharging apparatus comprising a power terminal connected to a utility power supply; a recharging apparatus recognition mark formed on the external recharging apparatus; a robot cleaner having a recognition mark sensor that detects the recharging apparatus recognition mark and a rechargeable battery, the robot cleaner automatically docking to the power terminal to recharge the rechargeable battery; and a power terminal control unit installed in the external recharging apparatus, for supplying power only during recharging of the robot cleaner.