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 ?  
4 T( i$ m1 ~6 v8 ~% X7 ]5.39.217.775.39.217.777 [4 x- S. N) E' V$ i+ \4 `
thanks in advance.