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