A portable communication terminal that includes various functions and is capable of displaying a menu showing the functions on a screen, the portable communication terminal comprising: a memory device that stores a custom-mode module that is designed for displaying a first menu showing on the screen preset particular functions, hereinafter referred to as first functions, wherein function setting of the first functions is displayed for allowing for manual function setting by a user, a simple-mode module that is designed for displaying a second menu showing on the screen only preset particular functions, hereinafter referred to as second functions, each of which is identical to a first function, wherein no function setting of the second functions is displayed, and an expansion module that is designated for displaying, on said first menu of the screen, user-selectable third functions in addition to the first functions, the third functions being different from the first functions; displaying means for displaying a screen for allowing the user to select one of the simple mode and the custom mode at the time of initial activation, wherein the displaying means is adapted, when the custom mode is selected, to display a message for allowing the user to select the third functions from the expansion module; the displaying means being adapted to display the first or second menu as a default on the screen, the displayed menu corresponding to a mode which has been selected at the time of initial activation, and reading means for reading a module corresponding to the selected mode on the screen from the memory device, and activates said module. a memory device that stores a custom-mode module that is designed for displaying a first menu showing on the screen preset particular functions, hereinafter referred to as first functions, wherein function setting of the first functions is displayed for allowing for manual function setting by a user, a simple-mode module that is designed for displaying a second menu showing on the screen only preset particular functions, hereinafter referred to as second functions, each of which is identical to a first function, wherein no function setting of the second functions is displayed, and an expansion module that is designated for displaying, on said first menu of the screen, user-selectable third functions in addition to the first functions, the third functions being different from the first functions; a custom-mode module that is designed for displaying a first menu showing on the screen preset particular functions, hereinafter referred to as first functions, wherein function setting of the first functions is displayed for allowing for manual function setting by a user, a simple-mode module that is designed for displaying a second menu showing on the screen only preset particular functions, hereinafter referred to as second functions, each of which is identical to a first function, wherein no function setting of the second functions is displayed, and an expansion module that is designated for displaying, on said first menu of the screen, user-selectable third functions in addition to the first functions, the third functions being different from the first functions; displaying means for displaying a screen for allowing the user to select one of the simple mode and the custom mode at the time of initial activation, wherein the displaying means is adapted, when the custom mode is selected, to display a message for allowing the user to select the third functions from the expansion module; the displaying means being adapted to display the first or second menu as a default on the screen, the displayed menu corresponding to a mode which has been selected at the time of initial activation, and reading means for reading a module corresponding to the selected mode on the screen from the memory device, and activates said module.