a communication terminal apparatus includes a disc member that is supported such that a portion thereof protrudes outside the body case , and that is rotated to output a signal corresponding to its rotation direction and rotation angle ; first switch operated by pressing the disc member toward the body case ; second and third switches separately operated by pivoting the disc member about a pivot axis parallel to the rotation plane and orthogonal to the pressing direction ; a storage device storing a plurality of items ; a display device displaying a cursor and a plurality of items read from the storage device ; and a control device for moving the cursor displayed in the display device and for selecting and executing the displayed items or other items required for communications in accordance with the operations of the disc member and the first , second , and third switches .