A radiographing apparatus for identifying a contour of a predetermined target structure of a subject in an image, includes an area setting unit configured to set a contour search area where the contour is to be searched based on anatomical features of the structure of the subject, a contour candidate setting unit configured to set a contour candidate of the target structure, and a contour adjustment unit configured to adjust the contour candidate to approximate the contour candidate included in the contour search area to the contour of the target structure.