An image processing apparatus includes a first display unit which displays a material image and an original image in fast and second areas on a display device, respectively; a detection unit which detects a position on the display device designated from an outside; a relationship determining unit which determines a designated position in the first area and a designated position in the second area, and which determines a correspondence relationship between the first area and the second area based on the designated positions; an allocation region determining unit which determines an allocation region in the second area; a cut region determining unit which determines a cut region in the first area to correspond to the allocation region based on the correspondence relationship; and a second display unit which displays a partial image corresponding to the cut region in the allocation region to display a combined image.