Relaying apparatus, method for relaying using the same and, 3d image system

PURPOSE: A relay apparatus, a relay method, and a 3D(three dimensional) system are provided to receive a synchronous signal and duty information, which are transmitted in an IR(Infrared Ray) type, from a 3D display apparatus, to generate a transmission packet according to an RF(Radio Frequency) communication protocol based the synchronous signal and the duty information and to transmit the generated transmission packet to 3D glasses. CONSTITUTION: A relay apparatus which relays communication between a 3D display apparatus and 3D glasses comprises a receiving unit(210), a control unit(220), and a communication unit(230). The receiving unit(210) receives an IR signal from the 3D display apparatus. The control unit detects control information for driving the 3D glasses included in the IR signal and generates a transmission packet according to an RF communication protocol based on the detected control information. The communication unit transmits the transmission packet to the 3D glasses. [Reference numerals] (210) Receiving unit; (220) Control unit; (230) Communication unit