A charging system and method for charging a communication terminal are
provided which supply to a battery a compensation current equivalent to
an amount of current input to a communication terminal. The charging
method includes detecting a value of current flowing to a communication
terminal when a battery attached to the communication terminal is being
charged by a charging device, outputting to the charging device a data
signal corresponding to the detected current value, and adding a
compensation current to the current input to the battery based on the
detected current value. Regardless of an operation of the communication
terminal, a constant current is supplied to the battery being charged,
and thus, time taken for completing charging of the battery can be
reduced.