REMOTE OPERATION SYSTEM AND METHOD AND REMOTE CONTROL DEVICE

To provide a remote operation method which is safe and simple for the user who does not have the enough operation knowledge on a control object apparatus installed within a house through an interactive interface. An in-house apparatus control unit has a function of sending or receiving an electronic mail to or from a portable telephone terminal and a function of making the other data communication, in which the user of the portable telephone terminal is authenticated safely according to the sender portable telephone number of the electronic mail or the ID of the sender terminal of data communication, and further an apparatus within the house is controlled by automatically judging the control contents to be requested from the contents of exchange of information with the user in an interactive form using an electronic mail or an application mounted on the portable telephone terminal.