Disclosed is a method for informing a user of an available battery time of a battery in a hybrid terminal based on the operating mode of the hybrid terminal. The hybrid terminal has a plurality of modes and performs a function corresponding to a selection of the user. A battery current amount is subdivided into a plurality of current amount levels for each operating mode of the hybrid terminal, and an available battery time in each operating mode is calculated for each current amount level, so as to generate an available battery time table. The generated available battery time table is stored in a memory of the hybrid terminal. The operating mode of the hybrid terminal, and the amount of current supplied to the hybrid terminal are detected. An available battery time corresponding to the detected current amount is obtained from the available battery time table. A text or a sound message indicating the obtained available battery time is displayed.