A mobile communication terminal and method of changing a function mode are provided. The present invention provides a user interface capable of changing its function according to a rotation of a body of the mobile communication terminal. The present invention includes a first body having a display unit, a second body, a connecting part connecting the first and second bodies together to enable the first and second bodies to mutually rotate centering on a prescribed axis, and a control unit arranged to change a function by determining a relative rotation direction between the first and second bodies, and to display an image corresponding to the changed function on the display unit.