请问怎样用subtitile的file (sub) ??

alantct

i hv a movie file, Lelio.Po.Po.2010.DVDRip.XviD.ONiE and another two files (seprate) is the sub  & idx file. may i know how to use or combine the video file so that i can watch it with subtitle ?  . [8 b1 V6 }1 X1 h1 ?& |" l5 j
公仔箱論壇  [, U( v1 c/ h4 G1 ]9 D0 e- D& r" V
thanks in advance.