To provide an image processing device and a program that are capable of combining an additional image with an original image in an area desired by a user or at a position close to the area.

An original image and an additional image are acquired, a detection area for detecting a blank portion corresponding to the additional image is specified in the original image, it is detected whether the blank portion exists in the detection area, and the additional image is combined with the detected blank portion. Then, when the blank portion is not detected, an area larger than the specified detection area including the specified detection area is re-specified as the detection area.