Provided is a treating apparatus including an ion generating apparatus configured to inject ionized elements into a diagnosis subject to remove a tumor in the diagnosis subject, and an image photographing apparatus configured to measure positions of the ionized elements in the diagnosis subject. The ion generating apparatus includes a target including a first element and a first isotope that is a radioactive isotope of the first element, and a laser configured to allow a laser beam to be incident on the target and thus ionize the first element and the first isotope.
