A method and apparatus of monitoring a control channel in a multiple carrier system is provided. The terminal base portion 31 is located in the lower part of the terminal 30 and retained in the left terminal-retaining member 51, and the swinging arm portion 33 extends upward from the terminal base portion 31 and is capable of undergoing elastic deformation to swing back and forth. The buttons are provided with openings that allow the passage of suturetape limbs.