Unmanned aircraft and method for controlling unmanned aircraft

A method for controlling an unmanned aircraft including a plurality of rotors, the method comprising:

• in a case of having detected an abnormality during flight, identifying a forced landing site;
• and
• controlling at least part of a plurality of motors configured to drive the plurality of rotors respectively, to make a landing at the identified forced landing site, wherein
• the method further includes controlling at least the plurality of motors to automatically fly in accordance with information on a flight route to a destination site;
• the information on the flight route includes one or more via-points and a correspondence relationship between the one or more via-points and a plurality of predetermined sites such that each via-point is assigned a specific predetermined site of the plurality of predetermined sites;
• and
• identifying includes identifying the specific predetermined site as the forced landing site from among the plurality of predetermined sites based on the correspondence relationship assigned for a most recent via-point that the unmanned aircraft has passed through among the one or more via-points.