Electronic device and operating method therefor

Disclosed in various examples of the present invention are a method and a device for enabling a system function using a system button to be used according to a user input, when displaying a picture related to an application through the entire area of a display without displaying a system button (provided transparently or translucently). According to various examples of the present invention, an electronic device comprises a display, a memory, and a processor electrically connected to the display and the memory, wherein the processor can be configured so as to sense, on the display, a user input through a touch region including the system button, identify the user input, and execute a system function by means of the system button or an application function according to the user input in the touch area including the system button. Various examples are possible.