To provide an image processing method which makes a display on a screen always in the same direction with image information.

This method has a step (S107) where the direction of the image information of 1st image data generated by reading an image of a document is decided, a step (S108) where the angle that the direction of the image information and the display direction on the screen is calculated, a step (S109) where 2nd image data are generated by rotating the 1st image data corresponding to the angle, and a step (S112) where the 2nd image data are displayed on the screen.