1. A method of controlling a position of a radiation treatment system, comprising: capturing, by a processor, a first image of a patient on a first axis and a second axis using a first camera and capturing a second image of the patient on the second axis and a third axis using a second camera; acquiring, by the processor, a third image of the patient captured using the first camera and a fourth image of the patient captured using the second camera during previous radiation treatment; calculating, by the processor, a first position change of the patient on the first axis and the second axis using the first image and the third image and calculating a second position change of the patient on the second axis and the third axis using the second image and the fourth image; and controlling, by the processor, a position of the patient using the calculated first position change and the calculated second position change so that the position of the patient is identical to a position of the patient during previous radiation treatment.