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