A computer system including a display unit to display a display area of the computer system, a wireless communications module to interface with at least one external device, a pointing processing unit to move a pointer indicated on the display unit in correspondence to a first radio signal input through the wireless communications module, and a controller which controls the wireless communications module to output a second radio signal, which corresponds to the first radio signal, to the external device when the pointer points to a changeover area of the display area of the display unit for a predetermined time.