1. A method of segmenting an object in an image, the method comprising: obtaining a first image including the object; receiving an input signal including information about a predetermined position in the first image; selecting at least one pixel included in the first image, based on the position information; generating a second image by dividing the first image into several areas, using the selected at least one pixel; and segmenting the object in the first image by using the first image and the second image.