An accessory includes a main body including a communication module that is configured to communicate with a predetermined network, and a container including a main body-coupling portion that is configured to separably couple to the main body. The main body includes at least one of (i) a remote control module that is configured to transmit an optical signal for controlling a predetermined apparatus within a predetermined range or (ii) a sensor module that is configured to sense information about a surrounding environment. The container includes an external coupling portion that is configured to couple the container to an external object.