An monitor includes a host and a first display communicatively connected to the host. In a display screen switching method for the monitor, it is detected that a second display is connected, the second display is provided independently of the monitor. It is detected that a display screen switching instruction is received and a display file corresponding to configuration parameters of the second display is read, the display file includes one or more physiological parameters to be displayed, an interface layout and interface elements. Data of the one or more physiological parameters are acquired according to the display file and generating frame data for representing pixel values of pixels on a display interface. The frame data are output to the second display to display data of the one or more physiological parameters.