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