A method of controlling a terminal device including receiving a message transmitted from a terminal device, storing the message received in association with identification information and state information of the message in a storage, displaying messages from various terminal devices together with state information thereof on a display, the messages including the first message, accepting an input for the display from a user, determining whether or not an entirety of the message is displayed on the display as a result of a display transition, updating the state information of the message as a read state indicating the message has been read in response to the determining indicating that the entirety of the message is displayed on the display, and transmitting the message, the updated identification information of the message, and the updated state information associated with the message to the terminal device may be provided.