| 摘要 |
Provided is a presence display terminal device comprising a registration unit for registering presence targets, an update information receiving unit for receiving update information indicating an update of the presence targets registered, a control unit for displaying a predetermined one of the presence targets registered, in a screen, and an update presence information acquisition unit for deciding it on the basis of the update information whether or not the presence target displayed on the screen is to be updated, thereby to acquire the updated presence information of the presence target decided to have been updated. |
