This specification relates to a method for controlling an artificial intelligence system which performs a multilingual processing based on artificial intelligence technology. The method for controlling an artificial intelligence system which performs a multilingual processing includes: receiving voice information through a microphone; determining a language of the voice information, based on a preset reference; selecting a specific voice recognition server from a plurality of voice recognition servers which process different languages, based on a result of the determination; and transmitting the voice information to the selected specific voice recognition server.