1. An X-ray computed tomography apparatus, comprising: an X-ray source configured to radiate an X-ray toward an object; an X-ray detection unit configured to detect the X-ray through the object and to generate a corresponding signal; a data acquisition unit configured to acquire data based on the corresponding signal; a reconstruction unit configured to continuously reconstruct a tomographic image of the object based on a predetermined term based on the acquired data; a creation unit configured to continuously create a plane image of the object by a predetermined term based on the acquired data; and a display unit configured to display both the tomographic image and the plane image.