A computer, monitor and a display method of the computer are provided. The computer includes a display card with a graphics processing unit (GPU) and a display memory used to receive the data to be displayed, process the data to be displayed and output the processed data to be displayed on the monitor; a power management module is used to manage the power supply status of the GPU and the display memory; a central processing unit (CPU) used to control the display card to enter power saving mode through the power management module when the predetermined conditions are met, make the GPU in a non-power-supply status and the display memory in a power-supply status.