@zubairmanzar
hope you are fine dude. looks like you recently bought the vehicle and its going to be your first time you're going to change the oil/oil filter.
in Vitz 2005, oil filter is of a slight different type, i.e. it does have a oil filter which contains a cartridge. When you change oil, only cartridge needs to be changed not the whole oil filter. The same kind of cartridge is used in Toyota Belta, Premio...
I am in Lahore now and dont have access to my car, otherwise i have taken a picture and sent you, but here is a tip to locate the oil filter...
open your bonet and try to find it on the left side (i.e. just deep below the washer liquid bottle)... the shape of the oil filter is exactly the same as a typical oil filter.
Hope it helps...