A method and an apparatus by which a remote user interface (UI) client device provides a remote UI service, the method comprising receiving an event message, which includes a URL for accessing a first UI resource providing a UI notifying the receipt of a message, from a remote UI server device; obtaining the first UI resource from the remote UI server device by using the URL; receiving external inputs of message control commands via the first UI resource; and transmitting the message control command to the remote UI server device.