Information linkage system, terminal device management server, subscriber management server

In an information linkage system according to an embodiment, a subscriber management server is provided with: a storage unit that stores a list of permitted terminal device identification information, which is a list of terminal device identification information of a terminal device for which the subscriber management server has acquired viewing-related information permitted by a subscriber; an acquisition unit that acquires permission information including information indicating that a subscriber of the terminal device has permitted the subscriber management server to acquire the viewing-related information and terminal device identification information of the terminal device; and a control unit that, when the permission information is acquired, adds the terminal device identification information included in the permission information to a permission terminal device identification information list. A terminal device management server, which manages a plurality of terminal devices having a display function, p