Localised audio data delivery

at least one piece of the beacon equipment (12, 14) in which radio message transmission has a possible communications system, and 斯 -- it has at least one piece of portable equipment (10) which can receive message transmission [like]. The above-mentioned beacon (12) is constituted so that a series of reference messages (60) may be respectively broadcast with the form of two or more predetermined data fields (INQ) arranged according to the 1st communications protocol like Bluetooth. In order to distribute additional data through broadcast, a beacon (12) adds further the data field (BCD) of the addition which transmits audio information to each reference message in advance of transmission. The above-mentioned portable equipment (10) receives the transmitted reference message, reads the above-mentioned audio information in the data field of the above-mentioned addition, and reproduces this audio to a user.