said detecting step comprises detecting the binary data of the designating information embedded in {HEAD ~ the document data} for each kind of area of {TAIL ~ the document data} separated in said separating step 
said detecting step comprises detecting the binary data of the designating information embedded in { HEAD ~ the document data } for each kind of area of { TAIL ~ the document data } separated in said separating step
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH