PROBLEM TO BE SOLVED: To provide a display management device, program, display management method and display management system that allow a display of information by a non-participation planned participant to be prohibited.SOLUTION: A display management device managing a shared display of information between terminal devices comprises: authentication means that performs authentication of a terminal device using authentication information set by being associated with a group; and data control means that prohibits a display of information by the terminal device authenticated by a group of non-participation planned participants in the shared display of the information from being displayed after the shared display of the information is ended on the basis of management information associated with a group of a participation planned person in the shared display of the information, a group of participants participating in the share display of the information, start information indicative of presence or absence of a s
