After that, the controller 18 makes a determination whether the work command is completed, step 170. The work command here means the cleaning work that is performed driving the cleaning path or moving to the target position. If the work is not completed, steps 140 to 160 are repeated until the work is completed. Alternatively, according to a fourth preferred embodiment of the present invention, when the ceiling has an orthogonal outline, a method is adopted for driving the robot cleaner 10 so as to reduce the compensation process load in regard to the driving path by photographing the ceiling. For example, as shown in FIG. 8, when the ceiling is arrayed with rectangle plaster boards 34 or when a plurality of direct-light fluorescent lamps 35 are installed on the ceiling, the controller 18 or/and the remote controller 40 are established to compensate for any driving error by using the condition of the ceiling that provides the orthogonal outline defined by the edges of the plaster boards 34 or fluorescent lamps 35.