In a multiple network access method in a communication device including at least one protocol stack having a physical layer and a medium access control (MAC) layer, and at least one application unit for performing communication through the protocol stack, the method includes applying a first parameter to the protocol stack and a first attribute to the application unit, accessing a first network for a first attribute to the applications, switching the first parameter into a second parameter and the fist attribute into a second attribute, and accessing a second network for a second hour after the switching.