COMMUNICATION DEVICE, COMMUNICATION SYSTEM, COMMUNICATION METHOD AND INFORMATION RECORDING MEDIUM

摘要

Mobile terminals (10A, 10B, 10C, 10D): receive, from a server (11), post information containing a message and the post position of the message; identify a relative position of a poster in relation to the position of a listener; identify a relative orientation that is from the position of the listener to the position of the poster in relation to the orientation of the listener's face; synthesize an audio signal expressing the message; adjust a sound volume balance such that the message is audible to the listener from the direction of the post position; and play the audio signal for which the sound volume balance has been adjusted.