1. A printing method capable of copying an image printed on a surface of a first disk medium onto a surface of a second disk medium, comprising: a first scanning step of optically scanning the image printed on the surface of the first disk medium, and storing image data representing the image in a memory; a second scanning step of optically scanning a state of the surface of the second disk medium and acquiring data on the state of the surface; a location step of locating a printable area of the second disk medium by analyzing the data acquired in the second scanning step; and a printing step of copying the image in the printable area located in the location step on the basis of the image data stored in the memory.