An information processing device and travel information voice guidance method for moving objects, capable of reliably providing travel information through voice guidance while avoiding insofar as possible the interruption of the user's enjoyment of music during music playback, comprising a song playback portion which outputs song audio signals representing song sounds; a travel information generation portion which generates travel information; a song playback judgment portion which judges whether, when travel information is generated, the song playback portion is outputting song audio signals; and voice guidance output portion which, when it is judged that song audio signals are being output, gives priority to output of voice guidance audio signals representing the above travel information over the above song audio signals, according to at least either one of the urgency of the above generated travel information, and the type of musical phrase in the song for which the above song audio signals are currently being output.