Content management device, content management system, and control method

A content management device includes: a storage that stores (a) a content generated by imaging performed by a first terminal that is at least one of a plurality of terminals, (b) a time at which the imaging of the content was performed, and (c) a history indicating whether each of one or more terminals among the plurality of terminals excluding a second terminal received, during a period that includes the time at which the imaging was performed, a beacon signal transmitted from the second terminal by radio waves, the second terminal being at least one of the plurality of terminals; and a manager that manages the content as a permissible content that is permitted to be presented by the plurality of terminals when determining, with reference to the storage, that each of the one or more terminals received the beacon signal during the period.