In a full-screen display method, a multimedia file is displayed in non-full screen on an application interface; and an instruction for displaying the multimedia file in full screen is detected, and it is determined whether a window displaying the application interface is a graph whose aspect ratio is in a preset interval. If the window is a graph whose aspect ratio is in the preset interval, the multimedia file is displayed in full screen in the window based on a current display direction of the application interface, where the current display direction of the application interface includes: a display direction of the application interface obtained when the instruction for displaying the multimedia file in full screen is detected.