In step 201, the tag extractor 121 extracts {HEAD ~ all HTML tags} from {TAIL ~ an e mail} in the plurality of e mails 
from
In step 201 , the tag extractor 121 extracts { HEAD ~ all HTML tags } from { TAIL ~ an e mail } in the plurality of e mails
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH