Disclosed in various examples are an electronic device comprising a rotary switch, and a function control method therefore, the electronic device comprising the rotary switch by which a user can select a waterproof function and a microphone function, and informing, through an icon and/or a sound, the user of whether the electronic device is in a waterproof mode or a microphone mode according to the operation of the rotary switch, such that the user can easily select the waterproof mode or the microphone mode.