1. A drawing display device, comprising: original image storage means for storing an original image; region designation means for designating a desired region within the original image; desired image saving means for reading a desired image comprising the entire designated desired region from the original image and storing the desired image separately from the original image; enlargement/reduction ratio acquisition means for acquiring an enlargement/reduction ratio (P) with respect to the original image; enlarged/reduced original image creating means for creating an enlarged/reduced original image by enlarging/reducing the original image with the acquired enlargement/reduction ratio (P) in both a long-side direction thereof and a short-side direction thereof; enlarged/reduced desired image creating means for creating an enlarged/reduced desired image by enlarging/reducing the desired image with the acquired enlargement/reduction ratio (P) at least in the long-side direction of the desired image; and display means for displaying the created enlarged/reduced original image and the enlarged/reduced desired image together.