An application interface display method, applied to a terminal device, and comprising: if it is detected that at least one first menu on a first application interface receives a touch event entered by a user, starting a second application interface corresponding to any one of the at least one first menu; and adjusting the second application interface so that the second application interface is displayed in a preset mode, wherein the second application interface is used to implement a function of the first menu corresponding to the second application interface, wherein the first application interface comprises a third region used to display the at least one first menu and a fourth region on which no interface element is displayed, and in the preset mode, a first region that is of the second application interface and that corresponds to a location of the third region along a direction perpendicular to a display screen of the terminal device is a transparent region, a second region that is of the second application interface and that corresponds to a location of the fourth region along the direction perpendicular to the display screen of the terminal device is a non-transparent region, an interface element of the second application interface is displayed in the second region, the first application interface and the second application interface are simultaneously in an active state, and, along the direction perpendicular to the display screen of the terminal device, the second application interface is located at an upper-layer and the first application interface is located at a lower-layer, wherein the adjusting the second application interface so that the second application interface is displayed in a preset mode comprises: obtaining an area of the third region of the first application interface; dividing the second application interface based on the area of the third region of the first application interface, to form the first region and the second region, so that an area of the first region is greater than or equal to the area of the third region; adjusting the interface element displayed on the second application interface, so that the interface element of the second application interface is displayed in the second region; and performing transparency processing on the first region of the second application interface based on preset transparency, so that the first region on which transparency processing has been performed is a transparent region. if it is detected that at least one first menu on a first application interface receives a touch event entered by a user, starting a second application interface corresponding to any one of the at least one first menu; and adjusting the second application interface so that the second application interface is displayed in a preset mode, wherein the second application interface is used to implement a function of the first menu corresponding to the second application interface, wherein the first application interface comprises a third region used to display the at least one first menu and a fourth region on which no interface element is displayed, and in the preset mode, a first region that is of the second application interface and that corresponds to a location of the third region along a direction perpendicular to a display screen of the terminal device is a transparent region, a second region that is of the second application interface and that corresponds to a location of the fourth region along the direction perpendicular to the display screen of the terminal device is a non-transparent region, an interface element of the second application interface is displayed in the second region, the first application interface and the second application interface are simultaneously in an active state, and, along the direction perpendicular to the display screen of the terminal device, the second application interface is located at an upper-layer and the first application interface is located at a lower-layer, wherein the adjusting the second application interface so that the second application interface is displayed in a preset mode comprises: obtaining an area of the third region of the first application interface; dividing the second application interface based on the area of the third region of the first application interface, to form the first region and the second region, so that an area of the first region is greater than or equal to the area of the third region; adjusting the interface element displayed on the second application interface, so that the interface element of the second application interface is displayed in the second region; and performing transparency processing on the first region of the second application interface based on preset transparency, so that the first region on which transparency processing has been performed is a transparent region. obtaining an area of the third region of the first application interface; dividing the second application interface based on the area of the third region of the first application interface, to form the first region and the second region, so that an area of the first region is greater than or equal to the area of the third region; adjusting the interface element displayed on the second application interface, so that the interface element of the second application interface is displayed in the second region; and performing transparency processing on the first region of the second application interface based on preset transparency, so that the first region on which transparency processing has been performed is a transparent region.