A scanning controller, a scanning apparatus and a method for performing the scanning controller are disclosed herein. The scanning controller includes an image data processing unit, a memory control unit, a dummy line control unit, a buffer condition control unit, a motor condition control unit, a motor controlling unit and a relation control unit. Based on at least one of several predetermined contrastive relationships among each stored data amount with regard to an image buffer and its corresponding motor move timing, the relation control unit controls generation of a motor move timing from the motor controlling unit to drive a motor with variance of a scanned data generation rate and simultaneously enable determination of the dummy line control unit on which part of scanned image data should be skipped by catching of the image data processing unit.