This research focuses on movies as a new communicationtool, and proposes a self expression movie generating system “atMOS”. The purpose of this research is to encourage mobile movie communication. Therefore, this system adopts the concept of exchangeability, expressivity and reproducibility for mobilemoviecontents. In “atMOS”, based on the sub-concept of “self packaging movie”, users can make an original promotion movie of themselves which can be viewed on 3G cellular phones. Users can enjoy the original movie not only by themselves but also with other people by exchanging these movies as a communicationtool,usingthecellularphone. Keywords MediaDesign,Mobile,Movie,CellularPhone,3GPP MediaCommunication,Performance, Sensing,