That would depend on whether the manufacturer has ported a later version for it and made it available OR if its a popular enough device whether the programming community has created/ported an upgrade for it.
What brand/model?
Nothing is impossible for the man who doesn't have to do it himself - A. H. Weiler
Looking at this site it appears you can indeed update to Gingerbread (2.3). (Btw, 2G = if you have the 2 GB version, 4G = if you have the 4GB version)
I suggest taking any further inquiries there, as they have a dedicated forum for the aPad and it's variants.
Finally, I hope this wasn't your first impression of the Android OS, because a cheap Chinese tablet doesn't do justice to what the platform is capable of. :P
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