PURPOSE: To indicate a price or the like easily and speedily, by a method wherein articles are individually packaged by a packaging material obtained by providing a heat-sensitive part on the surface of a packaging material, the packaged articles are packed in a bundle with the heat-sensitive parts directed to the outside, and printing is conducted by pressing a heated type against the heat- sensitive parts.

CONSTITUTION: Articles are individually packaged by a film material provided with a heat-sensitive part by applying, printing or adhering a heat-sensitive material to the surface of a packaging film material having relatively high heat resistance (e.g., polypropylene), then a predetermined number of the packaged articles are bundled with the heat-sensitive parts directed to the outside, and are packed in a bundle by a packing material. When forwarding the products from the maker or at a stage of circulation, heated types are pressed against the package to discolor the heat-sensitive material, thereby performing thermal printing on the packaged articles.