The control unit may further comprise a window system processing device for refreshing the graphic display by producing the graphic display data based on the original data for the graphic display, a power on resuming device for returning the data held in the second storing device to {TAIL ~ the first storing device}, and a refresh requesting device for requesting the window system processing device to refresh {HEAD ~ graphic display} after the data has returned to the first storing device 
The control unit may further comprise a window system processing device for refreshing the graphic display by producing the graphic display data based on the original data for the graphic display , a power on resuming device for returning the data held in the second storing device to { TAIL ~ the first storing device } , and a refresh requesting device for requesting the window system processing device to refresh { HEAD ~ graphic display } after the data has returned to the first storing device
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