A communication device combining a communication function and a positioning function and an operation method thereof are provided. The communication device includes a photonics-based sub-terahertz (sub-THz) transmission unit configured to transmit a terahertz (THz) signal generated by beating two optical signals having different wavelengths and a positioning unit configured to determine a position of a target using the THz signal transmitted by the photonics-based sub-THz transmission unit and received by the positioning unit by being reflected by the target, wherein the photonics-based sub-THz transmission unit is configured to adjust a transmission direction of the THz signal based on the position of the target determined by the positioning unit.