An electronic whiteboard includes a white list in which predetermined software is registered, a mode switching unit configured to switch a normal mode in which software unregistered in the white list is not permitted to be installed and an install mode in which the unregistered software is permitted to be installed, an invalidating/validating processor configured to invalidate the white list in the install mode, and a registerer configured to register software installed while the white list is invalidated in the white list, in which the invalidating/validating processor validates the white list after the installed software is registered in the white list.