Abstract: The present invention provides an apparatus for adjusting registration to correct distortion and color shift of images on a display screen which comprises RAMs (13) and (15) for storing correction data for deflection used to correct scanning positions of image signals for respective plural adjustment points arranged on the display screen along the horizontal direction and the vertical direction, and an Interpolation calculation block (18) for determining the number of interpolation scanning lines being the number of scanning lines which are scanned between the adjustment points corresponding to input image signals as well as for performing interpolation calculation based on the number of interpolation scanning lines for correction waveforms corresponding to display screen position induced from the correction data of the respective adjustment points to generate current signals to be applied to deflection yokes.