Abstract: There is provided an audio information providing system that can solve the problem with the audio lag and includes navigation with higher accuracy. The audio information providing system is an audio guidance system including an audio output device that is worn in the ear of a user and an information processing terminal that is communicatively connected to the audio output device. The audio output device includes: an audio output unit configured to output audio to the ear of the user; and a detection unit configured to detect the direction of the head of the user.