Apparatus for change of representation contents of sub-display of folber type mobile phone

PURPOSE: An apparatus for changing display contents of a sub-display of a mobile communication terminal is provided to freely change displayed contents of a sub-display by simply rotating a rotary switch, thereby simply and conveniently obtaining information wanted by a user. CONSTITUTION: A rotary switch(110) is rotatively installed in front of a sub-display installed at a folder part case(100) of a mobile communication terminal. A rotation sensor(150) is installed in the folder part case(100) adjacent to the back of the rotary switch(110). A control unit is installed inside the folder part case(100) with one side connected with the rotation sensor(150), and the other side connected with the sub-display.