A mobile communication terminal comprising an input device, wherein the input device comprises: a controller unit comprising a trackball unit comprising a trackball that is provided to rotate within a housing and a rotation detector for detecting the rotation of the trackball; a navigation key unit that is adjacently disposed to an outer circumference of the controller unit; and a Printed Circuit Board, PCB, for receiving a signal that is input through the controller unit and the navigation key unit, characterized in that the navigation key unit (A220, A320) is further configured to receive at least two input operations with a press method and an input operation with a touch method, wherein the navigation key unit comprises: a manipulation panel that is disposed to surround the trackball, an upper surface of the manipulation panel having a concave central portion for not disturbing the direction manipulation toward top, bottom, right and left portions of the manipulation panel by the trackball, the manipulation panel configured to receive a pressing input and a touch input; four contact detectors that are disposed in a position of the PCB corresponding to top, bottom, right and left portions of the manipulation panel to detect the manipulation of the manipulation panel by a pressing input; and a sensor that is disposed between the housing and the four contact detectors, the sensor configured to sense a signal changing according to contact with the manipulation panel for sensing a touch input, wherein the Printed Circuit Board receives the input signal via the rotation detector, the contact detectors and the sensor, and wherein the controller unit is used as a mode switching key for performing the switch between a first mode of performing an input operation with only a press method in the navigation key unit and a second mode of performing an input operation with only a touch method in the navigation key unit. a controller unit comprising a trackball unit comprising a trackball that is provided to rotate within a housing and a rotation detector for detecting the rotation of the trackball; a navigation key unit that is adjacently disposed to an outer circumference of the controller unit; and a Printed Circuit Board, PCB, for receiving a signal that is input through the controller unit and the navigation key unit, characterized in that the navigation key unit (A220, A320) is further configured to receive at least two input operations with a press method and an input operation with a touch method, wherein the navigation key unit comprises: a manipulation panel that is disposed to surround the trackball, an upper surface of the manipulation panel having a concave central portion for not disturbing the direction manipulation toward top, bottom, right and left portions of the manipulation panel by the trackball, the manipulation panel configured to receive a pressing input and a touch input; four contact detectors that are disposed in a position of the PCB corresponding to top, bottom, right and left portions of the manipulation panel to detect the manipulation of the manipulation panel by a pressing input; and a sensor that is disposed between the housing and the four contact detectors, the sensor configured to sense a signal changing according to contact with the manipulation panel for sensing a touch input, wherein the Printed Circuit Board receives the input signal via the rotation detector, the contact detectors and the sensor, and wherein the controller unit is used as a mode switching key for performing the switch between a first mode of performing an input operation with only a press method in the navigation key unit and a second mode of performing an input operation with only a touch method in the navigation key unit. a manipulation panel that is disposed to surround the trackball, an upper surface of the manipulation panel having a concave central portion for not disturbing the direction manipulation toward top, bottom, right and left portions of the manipulation panel by the trackball, the manipulation panel configured to receive a pressing input and a touch input; four contact detectors that are disposed in a position of the PCB corresponding to top, bottom, right and left portions of the manipulation panel to detect the manipulation of the manipulation panel by a pressing input; and a sensor that is disposed between the housing and the four contact detectors, the sensor configured to sense a signal changing according to contact with the manipulation panel for sensing a touch input, wherein the Printed Circuit Board receives the input signal via the rotation detector, the contact detectors and the sensor, and wherein the controller unit is used as a mode switching key for performing the switch between a first mode of performing an input operation with only a press method in the navigation key unit and a second mode of performing an input operation with only a touch method in the navigation key unit.