[ Formula 21 ] [ c 1 ??? ] = ??? [ O 1 ??? ] , ( 24 ) = [ J 11 J 12 ??? J 1 m ??? ??? ??? ??? J m 1 J m 2 ??? ] ( 25 ) It is assumed herein that the target sample contains the first to mth (where m is an integer of 2 or more) fluorescent dyes and that the first to mth band-pass filters are prepared corresponding thereto.