Abstract: A method and a system for automatic monitoring made by a portable image-capturing apparatus are disclosed. The apparatus includes an image-capturing module, an image variation detecting module, and an automatic video recording module. The method preferably uses the image variation detecting module to determine whether or not a variation event occurs in a predetermined region. And the automatic video recording module records a video in the predetermined region according to the determination result. If the determination result is positive, the automatic video recording module then starts video recording. Next, if the variation event disappears for a period of time, the automatic video recording module stops recording the video.