HEAD-MOUNTED INFORMATION PROCESSING DEVICE

The present invention relates to a head-mountable information processing apparatus allowing a user to hear a desired sound even if ambient sound unnecessary for the user is present. The audio input interface (peripheral sound microphones 132 and 133) is worn in the vicinity of the user's ear, collects the ambient sound that occurs outside the head-mountable information processing apparatus, and converts the ambient sound into an input audio signal. The audio output interface (including headphones 122) generates the output audio signal, converts the generated output audio signal into an audio for output, and emits the audio for output toward the user. Based on a volume level of the input audio signal from the audio input interface and a volume level of the output audio signal from the audio output interface, a controller 125 determines whether or not a state in which the ambient sound is preventing the audio for output from being heard is occurring, and based on a determination result, the controller controls a sound emission operation of the audio output interface.