1. A method for power management of a dual camera device including two cameras, comprising: detecting, from a user interface, an indication that a change to a zoom factor is to occur; in response to the indication, operating with the two cameras turned on upon detecting the indication before the change is stabilized; selecting one of the two cameras according to a stable point of the zoom factor; and displaying images sensed by the selected one of the two cameras when the zoom factor reaches the stable point.