Traffic signal controlling device and method using identification information with hierarchy structure

PURPOSE: An apparatus and method for controlling a traffic signal using identification information of a hierarchical structure are provided to efficiently control a signal light on each road by using the identification information of the hierarchical structure. CONSTITUTION: A broadcasting signal receiving unit(210) receives a broadcasting signal. The broadcasting signal includes a control command and identification information of a hierarchical structure. A signal light control unit(220) determines whether a management signal light belongs to a control command target. A control signal performs a signal conversion according to the control command. A broadcasting signal analyzing unit analyzes a broadcasting signal. A time synchronizing unit synchronizes the system time of the management signal light with the system time of a reference signal light. An offset setting unit sets offset time. A signal conversion control unit outputs the control signal. The control signal begins the signal exposure of the management signal light at a delay point corresponding to the offset time. [Reference numerals] (100) Traffic control center; (200-n) n-th traffic signal controller; (210) Broadcasting signal receiving unit; (220) Signal light control unit; (230) Bidirectional communication unit; (250-1) First signal light; (250-2) Second signal light