1. A drawing display device, comprising: original image storage means for storing an original image having first and second sides that are perpendicular to each other, the first and second sides defining x and y axis directions of the original image, respectively; region designation means for designating a desired region that is associated with a specified region of the original image; desired image saving means for reading a desired image having an area corresponding to the entire area of the designated desired region from the original image and storing the desired image separately from the original image, the desired image being arranged at a position corresponding to a position of the specified region inside the original image along one of the x and y axis directions of the original image and having first and second sides that are perpendicular to each other; enlargement/reduction ratio acquisition means for acquiring an enlargement/reduction ratio (P) with respect to the original image as the original image is enlarged/reduced; enlarged/reduced original image creating means for forming an enlarged/reduced original image by changing magnification of the original image by the acquired enlargement/reduction ratio (P) in both the x axis direction of the original image corresponding to the first side of the original image and the y axis direction of the original image corresponding to the second side of the original image; enlarged/reduced desired image creating means for forming an enlarged/reduced desired image by changing magnification of the desired image by the acquired enlargement/reduction ratio (P) at least in a first direction of the desired image corresponding to the first side of the desired image, in correspondence with the enlargement/reduction of the original image; and display means for displaying the created enlarged/reduced original image and for displaying the enlarged/reduced desired image along an inner periphery of the display means at the position corresponding to the position of the specified region inside the original image along one of the x and y axis directions of the original image, wherein the position of the enlarged/reduced desired image relative to the position of the specified region remains the same even after the enlargement/reduction of the original image and the desired image.