An image display apparatus includes: a primary image processing device that performs image processing for an input image represented by input image information; a secondary image processing device that performs image processing for the input image processed by the primary image processing device; a light modulator that modulates an illumination light based on the input image information representing the input image processed by the secondary image processing device; and a projection optical system that projects the modulated light onto a screen as an image, wherein the secondary image processing device performs position adjustment processing, and outputs position information representing the display position of the input image to the primary image processing device after the position adjustment processing on the input image is completed, and the primary image processing device reflects the position information outputted from the secondary image processing device to perform position adjustment on the input image information.