To provide a method for operating outdoor advertisement utilizing an outer surface of a rental box.

In an outdoor advertisement method using the outer surface of the rental box, an advertisement display means 3a uses the outer surface of a rental box 3 as a display device to stick an advertisement poster, draw an advertisement by paint, attach a white screen to project advertisement contents by a liquid crystal projector, or attach an electronic display panel to electronically display advertisement contents. When a sponsor member server 2 designates a desired advertisement area and a desired advertisement period or time and makes an inquiry, installation places of advertisement display means 3a which are not reserved for advertisement in the desired advertisement area or on which advertisement is not displayed are displayed on a map by points and advertising expenses are presented as a response; and when advertisement contents are transmitted, ordering and order reception of advertisement are completed, and advertisement is displayed only for the desired advertisement period or time within the installation period of the rental box 3.