To provide an information output device capable of retrieving an information delivery device existing in a fixed delivery range from an information delivery device which is a transmission source, and delivering information to the information delivery device in the delivery range.

An information delivery system is equipped with a plurality of peers 200 to 204. The peer 200 which is an information delivery source transmits delivery information, self-position information and the set delivery range to adjacent peers 201, 204. When the adjacent peer 201 exists in the delivery range, it displays the delivery information on a display part and transfers the delivery information, the position information and the delivery range to the adjacent peer 202, based on the received position information, the delivery information and the self-position information. When the peer 201 does not exist in the delivery range, it stops the transfer of the delivery information, the position information and the delivery range.