A robot and a controlling method thereof are provided. The robot includes a driver unit configured to move a location of the robot, a sensor unit configured to sense an environment around the robot, and a controller configured to, in response to the location of the robot being changed by a user, check a current location of the robot by using the environment of the changed location sensed by the sensor unit and pre-stored map information, determine a task to be performed, based on the checked location and the environment of the changed location, and control the driver unit according to the determined task.