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 ?  2 c" f8 s3 S, M! A# V9 }( i7 n+ S
5.39.217.76% Q1 G  b; l/ n4 T8 }
thanks in advance.