1. An automatic scanning and positioning apparatus for a scout image, the apparatus comprising: a receiver configured to receive a scout image of a subject obtained through scout scanning with an X-ray computed tomography apparatus; a processor configured to: receive as an input a type of scan to be performed: check at least one position in the scout image according to a plurality of information contained in the scout image, wherein the plurality of information comprises gradient information, grayscale information, and position information of a skull of the subject, and the at least one position is selected based on the received type of scan, and determine a scanning scope based on the at least one position; and an executor configured to execute axial scanning with the X-ray computed tomography apparatus to the subject based on the determined scanning scope.