Beacon device, and communication system and method using the beacon device

A communications system consists of a primary station (100) and at least one secondary station (101). A primary station (100) is the form of two or more predetermined data fields put in order according to the 1st communications protocol like Bluetooth, and carries out the simultaneous transmissive communication of each of a series of inquiry messages. Furthermore, the primary station (100) can answer polling, when all of inquiry messages or the addition data field for polling one or the secondary station beyond it in part is added and they have data for transmission. This system has a secondary station (101) which has quick response time, and does not require a continuously active communication link.