1. An image processing apparatus comprising: a background image generation section that generates a background image containing new updated trace information that identifies at least one of the image processing apparatus and a user who instructs the image processing apparatus to form an image; and a combining section that combines the background image generated by the background image generation section with a foreground image to generate a composite image, the combining section that outputs the composite image to an image forming section that forms an image on a recording medium, wherein: the background image generation section arranges the updated trace information in an end region of the background image.