Image forming apparatus and method of displaying preview image

An image forming apparatus comprising:

• an image forming unit that prints image on papers based on print target data;
• a whole preview image generating unit that generates a whole preview image based on the print target data, the whole preview image being a print preview image of the entirety of each page;
• a display unit that displays image;
• a whole preview image display control unit that controls the display unit displaying the whole preview image;
• a divided preview image generating unit that generates divided preview images, the divided preview images being made by dividing the print preview image of each page in the print target data by a dividing number, the dividing number being set beforehand;
• a divided preview image enlarging unit that enlarges each of the divided preview images at higher magnification than a display magnification of the whole preview image of the display unit and generates enlarged divided preview images;
• and
• a divided preview image display control unit that controls the display unit displaying the enlarged divided preview images.