Provided is a tomography apparatus including: a data acquisitor configured to obtain a first image by using tomography data acquired as a first X-ray generator for generating X-rays having a first energy rotates around an object over a first angular range and obtain a second image by using tomography data acquired as a second X-ray generator for generating X-rays having a second energy rotates around the object over a second angular range； a controller configured to acquire motion information representing an amount of motion of the object over time by using the first and second images； and an image reconstructor configured to reconstruct a target image showing the object at a target time point by using the motion information.
