1. A method for extracting a lesion region from an image, the method comprising: setting an arbitrary point in the lesion region; determining a presence area containing the set arbitrary point, the size of the presence area being larger than a reference size of the lesion region, said reference size being a maximum size of lesions appearing in recorded images that are of a type identical to the lesion region; and extracting the lesion region from the image based on the set arbitrary point and at least one point outside the determined presence area, wherein the set arbitrary point and the at least one point outside the determined presence area are within a single image from which the lesion region is being extracted, and wherein the lesion region is extracted based on a graph cut segmentation method using data of the arbitrary point as a first label, and data of the point outside the determined presence area as a second label, and wherein within the presence area, each pixel is assigned to one of the first label and the second label based on a probability of each pixel corresponding a group of the first label or the second label.