A backlighting element 13 includes an EL panel for illuminating the back
of a display unit 11, to thereby provide a good viewing. A control unit
16 sends an instruction to a backlight driver 14, and intermittently
drives the backlighting element 13 at appropriate timings, or temporarily
stops the driving of the backlighting element 13 in synchronism with operation
timings of a radio processing unit 17. The radio processing unit is adversely
affected by noise generated when the backlighting element is operated. A light
storage member is provided on the backlighting element 13 or in its vicinity.
With provision of the light storage member, the lighting time of the backlighting
element is reduced. When the backlighting element is lit off, the user is not put
to inconvenience.