Display apparatus and method of synchronizing mouse sensitivities

A display apparatus is provided. The display apparatus is electrically connected to a host that runs an operating system. The display apparatus includes a display module, a display controller, a first Universal Serial Bus (USB) interface, and a USB hub. A first USB mouse is connected to the first USB interface, and the display controller stores a first sensitivity of the first USB mouse as a first sensitivity setting. When a second USB mouse is connected to the first USB interface or a second USB interface of the display apparatus, the display adjusts a first human interface device (HID) descriptor reported by the second USB mouse to generate a second HID descriptor, wherein a second sensitivity of the second USB mouse is different from the first sensitivity, and the second HID descriptor complies with the first sensitivity setting. The display controller reports the second HID descriptor to the host through the USB hub so the host controls a cursor of the operating system according to the second HID descript