switching, in accordance with a request from a user who uses said information related to {HEAD ~ state} of degradation, said information to be displayed to said user to any of {TAIL ~ said first to third display items} 
switching , in accordance with a request from a user who uses said information related to { HEAD ~ state } of degradation , said information to be displayed to said user to any of { TAIL ~ said first to third display items }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL