This is all speculation.
Darth Sidious says he was the apprentice of Darth Plagueis, who was said to prevent death from happening or even create life. But if this is true or if it was all an act to push Anakin over the edge to become Sidious new apprentice we dont know. There is no real proof that Darth Plagueis even excisted. And beside, Sidious HIMSELF said that "Only one has managed to cheat death, but together we may discover the truth" to Anakin at one point.
So either Sidious lied in his first story, or he is the one who has the power. Nevertheless, Padmé died so none helped Anakin in his quest it seems.
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http://www.killermovies.com/forums/a...is-really.html Here is alot of information about this matter. But remember, how Anakin came to be is all speculation apart from "being created by the force")