Unmanned aircraft, control method, and recording medium

An unmanned aircraft, comprising:

• a sensor that performs sensing of an external environment of the unmanned aircraft;
• a processor;
• a memory that stores a program, wherein when the program is executed by the processor, the program causes the processor to execute:
• detecting a suspicious person being in a building based on a result of the sensing performed by the sensor;
• obtaining area information indicating an area in the building, entry to which by the suspicious person is undesirable;
• identifying a route, within the building, which leads from a position of the suspicious person being in the building to the area, wherein the route is identified using map information indicating an inside of the building;
• determining, based on a positional relation between the position of the suspicious person and the area indicated by the area information, a second place as a destination place to which the unmanned aircraft is to move, the second place being within a first predetermined distance from a first place, and being located between the first place and the suspicious person, the first place being a place of which width is the narrowest among one or more places, within the building, included in the route, the first place being one at which the suspicious person has not yet arrived, wherein the second place is one of the one or more places included in the route within the building, and the second place is one at which the suspicious person has not yet arrived;
• and
• causing the unmanned aircraft to move to a destination position above the second place determined as the destination place, and hover at the destination position
• causing the unmanned aircraft to move to the destination position only when the position of the suspicious person is within a second predetermined distance from the area.