my tagalog sux but i'll give this Q a whirl.
most drum machines don't have an external input so you have to use some kind of mixer.... you can get around this a few ways... if you're monitoring on a bookshelf stereo or something you could use one the left for mono drums and the right for voice/gtr/etc..
or you can get something like an AdrenaLINN that's a combo drum machine & guitar processor/fx/amp simulator. i keep seeing them for $200 on ebay.
if you want to do anything more complicated than the L/R bookshelf idea you'll probably need a mixer/mbox/etc