A notification method includes determining, on the basis of positional information regarding a drone and positional information regarding a plurality of terminals carried by an operator who visually observes and operates the drone and one or more visual observers who visually observe the drone, at least either responsible observation areas, which are areas in which the operator and the one or more visual observers are to visually observe the drone, or responsible observation periods, which are periods for which the operator and the one or more visual observers are to visually observe the drone, and notifying the plurality of terminals of at least either the responsible observation areas or the responsible observation periods.