Display device and processing method for display device

A display device, comprising:

• a display, configured to, in a multi-window mode, display a first window and a second window, wherein a first audio or video is played in the first window;
• a memory, configured to store computer instructions and/or data associated with the display device;
• and
• at least one processor, connected to the display and the memory, and configured to execute the computer instructions to cause the display device to:
• in response to detecting that a focus is on the first window, display a volume control button in the first window, wherein the volume control button comprises a volume up key and a volume down key;
• receive a control command input by a user based on the volume control button, wherein the control command indicates a first trend of adjusting a volume, and the first trend is to increase the volume or decrease the volume;
• in response to the control command, identify whether an audio or video is played in the second window;
• and
• in response to identifying that a second audio or video is played in the second window, adjust an amplitude ratio of the first audio or video based on the first trend, and adjust an amplitude ratio of the second audio or video based on a second trend opposite to the first trend, wherein a sum of the adjusted amplitude ratio of the first audio or video and the adjusted amplitude ratio of the second audio or video is equal to a preset total ratio.