Method of printing thermal media by aligning image

Provided is a method of printing thermal media by aligning an image using a printer in which a thermal printhead, a feeding roller, and an edge detection sensor are sequentially disposed in a print proceeding direction. The method includes the steps of feeding a thermal medium having a first surface and a second surface so that a front edge of the thermal medium is movable a first distance from the edge detection sensor. The thermal medium print starting position is located under a heating element of the thermal printhead. A printing process for the first surface is performed while feeding the medium nad the thermal printhead is rotated so that the thermal printhead faces the second surface of the thermal medium. The thermal medium is fed so that the front edge of the thermal medium moves a second distance from the edge detection sensor. The print starting position of the second surface is located under the heating element of the thermal printhead. A printing process is performed for the second surface while feeding the thermal medium.