1. An image processing apparatus reducing images to generate a synthetic image having a plurality of printable area, comprising: a separating unit configured to separate a character object from a graphic object included in the synthetic image; a first metadata generating unit configured to generate first metadata from the graphic object; and a layout unit configured to lay out the synthetic image by adjusting a size of the graphic object so that the graphic object is arranged in one printable area included in the synthetic image, based on information about a size and an arrangement position of the graphic object included in the first metadata generated by the first metadata generating unit, according to a user instruction, and arranging the character object in a printable area except a region in which the graphic object has been arranged in a region of the synthetic image.