An itinerary editing processing program causes a computer to execute a process including receiving a plurality of editing processes corresponding to a user account with respect to an itinerary plan. The itinerary editing processing program causes the computer to execute the process including displaying, for each user account, an instruction component instructing canceling of an editing process from among the received plurality of editing processes that corresponds to a same user account; and canceling the editing process which corresponds to a user account that corresponds to a specified instruction component from among the displayed instruction components.