1. A method for saving power in a mobile terminal, comprising: measuring a remaining power capacity of a battery; determining whether the remaining power capacity of the battery is smaller than a prescribed reference value; and de-activating at least one non-essential telephone function when the remaining power capacity is smaller than the prescribed reference value, wherein deactivation of the at least one non-essential telephone function is not determined by a user and wherein when a power capacity of the battery is determined to be larger than the prescribed reference value, the mobile terminal is configured to allow operation of the at least one non-essential telephone function.