1. An X-ray imaging apparatus, comprising: an X-ray generator configured to generate X-rays and irradiate the generated X-rays toward a target object; an image capturer configured to capture an image of the target object; an image display configured to display the image of the target object captured by the image capturer; an input part configured to receive an input with respect to the image of the target object displayed by the image display, the input defining a segmentation region corresponding to a portion of the target object for which segmentation imaging is to be performed; and a controller configured to control movement of the X-ray generator to perform segmentation imaging based on a first sub-region of the segmentation region and based on a second sub-region of the segmentation region.