Patent ID: 8572484

Claim:
An image forming apparatus comprising: an input unit receiving input of image data; a storing unit storing the image data input from the input unit; a display image generator generating a display image based on the image data stored in the storing unit; a display portion having a display screen for displaying the display image generated by the display image generator; and a display controller having a function of providing preview display of the display image on the display portion, based on the image data input from the input unit, characterized in that: the input unit has a function of receiving additional input of new image data, after the image data is input; the display image generator has a function of separately generating a first display image based on precedent image data input before additional input and stored in the storing unit and a second display image based on additional image data that is additionally input; and the display controller as a function of providing preview display of the first display image and the second display image, on the same display screen of the display portion, in a distinctive manner, when the new image data is additionally input, and a function of displaying the second display image in an overlapping manner behind the first display image.