An X-ray photographing apparatus and a method of operating the X-ray photographing method are disclosed. The X-ray photographing apparatus includes a plurality of X-ray generators configured to generate an X-ray a plurality of X-ray detectors facing the plurality of X-ray generators and configured to detect X-rays that are transmitted through an object and a plurality of sensors, which are provided between the plurality of X-ray generators and the plurality of X-ray detectors, and which are configured to sense the object.
