Abstract: A visiting duration corresponding to a first current location is determined, on the basis of the first current location and a destination, a first traveling duration that is necessary for a user to travel from the first current location to the destination is calculated, on the basis of a first time, the visiting duration corresponding to the first current location, and the first traveling duration, a first expected arrival time is calculated, on the basis of a first scheduled delivery time and the first expected arrival time, a first difference is calculated, a first message in accordance with the first difference is transmitted to a first information terminal of the user, and the first information terminal displays the first message.