Viewability is improved creating more reliable visual recognition of an image including a copy-forgery-inhibited pattern image to clearly distinguish a copy and an original being displayed for preview. An image processing apparatus produces data of a copy-forgery-inhibited pattern image that is added to an image to be output for printing and comprises a latent image and a background image. The apparatus includes: a display unit for displaying an image; and a display control unit for distinctively displaying images, on the display unit, in a first display state displaying the copy-forgery-inhibited pattern image and in a second display state in which a display mode of at least one of the latent image and the background image of the copy-forgery-inhibited pattern image differs from a display mode of the image displayed in the first display state.