To provide a management device in which poor security is restrained while facilitating participation to convention.SOLUTION: A management device 50 for processing a participation request including an identifier for identifying the convention and an invitation code for participating to the convention, and hosting the convention between multiple transmission terminals has specification means 60 for specifying the convention by the identifier included in the participation request, management means 58 for managing the number of transmission terminals participating to the convention, on the basis of the invitation code included in the participation request, and confirmation means 56 for permitting or limiting participating to the convention, according to the number of transmission terminals managed by the management means.SELECTED DRAWING: Figure 1
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