Audio transmission system

An audio transmission system comprising:

• an unmanned aircraft including a plurality of rotors, the unmanned aircraft being able to fly upward, downward, leftward, and rightward in air, and having an airframe to which a speaker is attached;
• a steering terminal that can communicate with the unmanned aircraft by radio, the steering terminal being used to steer the unmanned aircraft;
• and
• an information terminal configured to access, via a network, a server providing a service for translating text data created in an official language of a country into a designated language other than the official language, and converting the translated text data into audio data, the information terminal being able to download the audio data from the server,
• wherein the information terminal transmits the audio data in the designated language downloaded from the server to the unmanned aircraft, and
• the unmanned aircraft outputs the audio data in the designated language as an audio message from the speaker attached to the airframe.