A method for providing a face adjustment image, comprising the steps of: (a) superimposing on a screen a two-dimensional cephalometric image having an X-ray image for a cranium of a patient whose face is to be corrected with a three-dimensional facial image for a face of the patient; and: (b) displaying on the screen a face adjustment image in which soft skin tissues in the three-dimensional facial image are transformed according to a change in hard tissue which is to be made by the face correction and is shown in the two-dimensional cephalometric image of a teeth model, wherein the step (b) comprises the steps of: determining transformation of the soft skin tissues corresponding to the change in the hard tissues; and displaying the face adjustment image on the screen based on the transformation of the soft skin tissues, wherein, in the step (a), a plurality of first alignment points arranged on the three-dimensional facial image are matched with a plurality of second alignment points arranged on the positions corresponding to those of the first alignment points on an outline of the two-dimensional cephalometric image, which is formed by the soft skin tissues, so that the three-dimensional facial image and the two-dimensional cephalometric image are superimposed, and wherein in the step (a), the two-dimensional cephalometric image is superimposed on a cross section of the three-dimensional facial image divided by a reference line arranged on the three-dimensional facial image, and wherein the reference line is a vertical line dividing the three-dimensional facial image to the left and right sides, and the two-dimensional cephalometric image is a lateral X-ray image obtained by photographing a head of the patient on a lateral side perpendicular to a front side of the face, and wherein the three-dimensional facial image is obtained by scanning the face of the patient, and wherein the step (a) comprises the steps of: arranging the first alignment points and the second alignment points; superimposing on the screen the two-dimensional cephalometric image inside of the three-dimensional facial image; and adjusting the size and orientation of the two-dimensional cephalometric image to the same as those of the three-dimensional facial image, wherein the first alignment points comprise a pair of facial alignment points; the second alignment points comprise a pair of outline alignment points located on the positions corresponding to those of the facial alignment points; and the step is performed by adjusting the size and orientation of a first vector formed by the pair of facial alignment points to the same as those of a second vector formed by the pair of outline alignment points. (a) superimposing on a screen a two-dimensional cephalometric image having an X-ray image for a cranium of a patient whose face is to be corrected with a three-dimensional facial image for a face of the patient; and: (b) displaying on the screen a face adjustment image in which soft skin tissues in the three-dimensional facial image are transformed according to a change in hard tissue which is to be made by the face correction and is shown in the two-dimensional cephalometric image of a teeth model, determining transformation of the soft skin tissues corresponding to the change in the hard tissues; and displaying the face adjustment image on the screen based on the transformation of the soft skin tissues, arranging the first alignment points and the second alignment points; superimposing on the screen the two-dimensional cephalometric image inside of the three-dimensional facial image; and adjusting the size and orientation of the two-dimensional cephalometric image to the same as those of the three-dimensional facial image,