A method for high speed motion estimation and an apparatus of a plurality of projection data are provided to increase the speed of the motion estimation of image and accuracy by using a plurality of projection data produced in the various the viewing angle degree. A projection data generator(110) generates a first projection data and a second projection data which project a specific projection angles. A comparison value profile generator(120) produces the reference value profile at viewing angle degrees from the first projection data and the second projection data. A comparison value field updating unit(130) updates the comparison value field by using the reference value profile. A projection angle selector(150) diversifies viewing angle degrees.
