A customer robot enabling a customer service including key management with respect to a plurality of lock-equipped objects in an environment such as vehicles in a parking lot is provided. The robot has an unlock/lock signal database storing unlock/lock signals respectively set for the objects, an object identification implementor recognizing an instruction of a customer and identifying one from among the objects which the customer wants unlocked/locked, an unlock/lock signal retriever retrieving one from among the unlock/lock signals, stored in the unlock/lock signal database, that is corresponding to the one from among the objects which the customer wants unlocked/locked, and an unlock/lock signal transmitter transmitting the retrieved signal to unlock/lock the identified object, thereby reducing the burden of the person responsible for key management.