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 ?  
/ Q$ Z& n) }2 q1 ?5.39.217.76
& o: `( V" x$ ~6 I9 S* i5.39.217.76thanks in advance.