Provided herein is a scanning device including a transmitting module dividing a subject into a plurality of image regions and emitting laser beam onto the plurality of image regions by an interlaced method, a receiving module receiving reflected laser beam from the subject, and a signal processing module scanning a shape of the subject by a Time Of Flight (TOF) technique based on the reflected laser beam, wherein the signal processing module generates a single image with respect to the shape of the subject by overlapping subframes generated by the interlaced method.