A mobile communication terminal and an operation method thereof are provided. The terminal includes: a detachable display window detached from a main body, for performing short-range wireless communication with the main body; and the main body for performing the short-range wireless communication with the detachable display window, wherein the detachable display window has a liquid crystal display (LCD) wireless communicating unit for providing a wireless communication depending on a short-range wireless communication protocol, and a LCD for displaying the predetermined image.