1. A color arrangement checking device comprising: a document storage unit storing a full-color document in which elements of each color are placed on a page; an attribute detection unit detecting at least a color and a size of the elements for each page of the document; an occupancy ratio calculation unit adding up the size of the elements for the whole page by the color and outputting this as an occupancy ratio; a color arrangement checking unit determining whether or not at least one of brightness and saturation exceeds a predetermined color threshold value for each color of the elements; an occupancy ratio checking unit determining whether or not the occupancy ratio by the color of the elements, which assume the color, of which at least one of the brightness and the saturation is determined to exceed the color threshold value, as an attribute, exceeds a predetermined occupancy threshold value; and a result output unit outputting the elements which assume the color, of which the occupancy ratio is determined to exceed the occupancy threshold value, as the attribute.