Method and system for updating firmware on a beacon device. The system includes: a communication unit and a control unit. The system broadcasts a beacon signal within a certain radius and exchanges information with the service device and the control unit and inquires of the service device about a firmware program version at a predetermined period basis by receiving the firmware program version from the service device and comparing a preset firmware program version with the received firmware program version for controlling the communication unit to stop broadcasting of the beacon signal if both versions are different from each other. The system also requests the service device to update the firmware program through the communication unit, and installs the firmware program received from the service device through the communication unit.