An image processing apparatus is an image processing apparatus that performs image processing on first image information of a target first image. The image processing apparatus has a controller and a first storage device which stores second image information of a second image. The controller reads the second image information stored in the first storage device, changes a resolution of the read second image information to a first resolution which is the same as a resolution of the first image information, and combines the first image information and the second image information based on the first image information and the second image information of which resolution is changed to the first resolution.