An electronic device includes an illumination module, an image projection module, a camera module and at least one processor. The processor, coupled to the illumination module, the image projection module and the camera module, determines that the electronic device executes a first or second operating mode according to an operation instruction of a user. When the first operating mode is executed, the processor enables the illumination module to generate a medium color temperature light, simultaneously enables the image projection module to project a window screen onto a plane, and allows the use to operate the window screen on the plane. When the second operating mode is executed, the processor enables the illumination module to generate a high color temperature light, simultaneously enables the image projection module to project a preset pattern onto the plane, and turns on the camera module to allow the user to take photo or image.