Disclosed herein is a function for controlling sound output during power on. Upon the start of its booting-up process, a mobile communication terminal determines whether a key for entering the silent mode is pressed by the user. If the corresponding key is pressed, the mobile communication terminal changes a sector of a profile in which sound information is stored, so as to boot-up in the silent mode. Because the mobile communication terminal can change the current profile during the booting-up, the user can prevent the power-on sound from being generated during power on.