when said mounting direction is inverted, said {HEAD ~ processing part} performs {TAIL ~ an inverting processing} on said signal to be provided to said device so that a provided direction of said contents inverts, while not performing said inverting processing on said signal to be provided to said external output unit, and 
performs
when said mounting direction is inverted , said { HEAD ~ processing part } performs { TAIL ~ an inverting processing } on said signal to be provided to said device so that a provided direction of said contents inverts , while not performing said inverting processing on said signal to be provided to said external output unit , and
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH