Methods for remotely controlling a mobile station being a monitoring device by a controller are provided. An embodiment of a method performed by the mobile station includes the following steps. An action request including a remote control instruction issued by the controller is received. The remote control instruction is acquired from the received action request. The remote control instruction is executed to perform a monitor-related function resident on the mobile station. The mobile station focuses on a subject and records the focused subject in video images. The action request is received through a wireless network.