A webcam apparatus and a monitoring system are provided. The webcam apparatus includes a camera, a processor, and a first communication module. The camera is configured to obtain a video screen. The processor is coupled to the camera. The processor analyzes the video screen. The first communication module is coupled to the processor. When the first communication module communicates with an electronic device, the first communication module outputs the video screen to the electronic device. When the processor determines that a moving object moves to a specific screen block in the video screen, the processor outputs a warning signal.
