To perform information delivery corresponding to the physical propagation distance from an information delivery device of an information delivery source to an information delivery device of an information delivery target.

In this information delivery device connected to other information delivery devices through a network, a message reception part 704b in the information delivery device connected to a plurality of other information delivery devices through the network receives delivery information to be delivered transmitted from another information delivery device, position information for showing the space position of another information delivery device, and a delivery allowable propagation distance for showing the maximum limit of a delivery range of the delivery information, and a propagation distance determination part 703 outputs the received delivery information to a display part 702 or a message transfer part 704c based on the received position information and delivery allowable propagation distance, and position information for showing the space position of the own device at the reception time.