http://en.wikipedia.org/wiki/Nineteen_Eighty-Four
It will all become clear!!!!!
The mysterious head of government is the omniscient, omnipotent, beloved Big Brother, or "B.B.", usually displayed on posters with the slogan "BIG BROTHER IS WATCHING YOU". It is never made clear whether Big Brother is an actual person or whether he is a fictitious leader created as a focus for the love of the Party. It is possible that the conflict between Big Brother and Emmanuel Goldstein is in fact a conflict either between two leaders who are either fictitious or dead, and whose true purpose is to personify both the Party and its opponents -- or, perhaps, even to personify "doublethink" by presenting a fictitous person to love and one to hate.