A receiver machine for loading a projector and receiving an interactive operation request, wherein after the interactive operation request is received, a projectable space instance for modeling a workspace is acquired by the receiver machine, wherein after the projectable space instance is parsed by the projector, a projected workspace corresponding to the workspace is built in the receiver machine, so that plural users are allowed to perform an interactive operation, wherein the interactive operation request contains a uniform resource identifier with an instruction code, and a task corresponding to the interactive operation is performed through the projected workspace according to the instruction code.