Movies edited by amateurs are likely to be a sequence of monotonous scenes, where people record video from a single direction, and use video from a single camcorder when editing video. We developed VideoBlocks, a web-based video editing system. In our system, video clips are collected from multi-users' camcorders via the Internet and shared among the users. The system allows users to easily use other users' video clips, each of which is spontaneously videotaped using different digital video camcorders. VideoBlocks provides the capability to extract the date and time information of the video-recording from the digital video cameras, and automatically synchronize them. Through evaluations of the system, we determined the effectiveness of the system.