<blockquote class="Quote" rel="mj14">@Xiaomau82 okay lang ba yun? Yung tita ko andito sa pinas. Sya daw mag sponsor ng trip ko. Ano kelangan ko iprepare na document na lang?</blockquote>
yung tita mo na magsponsor, pr ba sia or citizen ng au? if not, it wont help. mas gugulo ung reason and intention. unless sabay kayo mag aaply ng tita mo for visitor visa then u can make it appear like a family vacation.
U dont need invitation talaga to apply for au visitor visa pero kelangn may maibigy kang evidence na babalik ka pa tlaga. like what @batman said, provide all evidences of your properties would help.
How is your travel history so far? minsan kinoconsider din nila un. if u have previous visa from 1st world country siguro mas makakatulong un.