A printing apparatus forms image information and information associated therewith on a print medium. The printing apparatus receives image information from an image file stored in a recording medium, etc., and obtains information associated with the image information. The associated information includes attached information that is read out from the image file based on a file format using tags via an interface unit or added information that is input or selected in accordance with the image information. The image information is printed on the print medium, and the associated information is formed on a film sheet (laminate film), which is disposed over the image-printed surface, as a watermark. The associated information is not visible when the print medium is seen from the front, and can be seen when it is seen at an angle due to the difference in surface glossiness.