A system for automatically setting an environment of a user terminal includes a space and context-aware device for sensing a space and a context using a plurality of sensors, defining environment setting information corresponding to the sensed space and context, and sending the defined environment setting information to a user terminal, thereby requesting environment setting or release. Further, the system for automatically setting an environment of a user terminal includes a user terminal for changing environment setting mode while communicating with the space and context-aware device and automatically changing to a status corresponding to the environment setting information when the environment setting information is received.