To provide an attachment device in which for a user who gathers temporarily, an account that allows the user to participate in a community can be set appropriately and easily.
A reception part 61 receives main body information from an attached device, which is an attached information processing device. From another attached device, which is attached to another device, an information processing device other than the attached device, a communication part 62 acquires another device account information specifying such another device, and another device information corresponding to a position of such another device. An authentication part 63 performs authentication of such another device on the basis of the main body information received by the reception part 61 and such another device information received by the communication part 62. When authentication of such another device succeeds at the authentication part 63, a setting part 64 transmits such another device account information to a server managing a community, to thereby set an account for participating in the community to such another device.
Ishibashi Masayuki
Masaaki Ogata