1. A remote monitoring method for a smart TV, wherein the smart TV is connected to a plurality of external devices, comprising: retrieving real-time status information of the smart TV and an external device, wherein the external device is connected to the smart TV at a particular connection level, wherein the real-time status information is recorded in advance to facilitate quick retrieval; transmitting the real-time status information to the remote device by the smart TV in response to detection request information transmitted from the remote device, such that the remote device monitors a real-time status of the smart TV and the external device; receiving a control command transmitted from the remote device; and performing an operation control according to the control command; wherein the detection request information comprises a hop count corresponding to the particular connection level of the external device to facilitate the retrieval of the real-time status information of the external device; and wherein the hop count is decreased by one when the detection request information is received by the smart TV or one of plurality of external devices, and the detection request information is further forwarded to an adjacent external device when a remaining hop count is non-zero.