To provide an event sharing system, a host, an event sharing method and an event sharing program capable of properly delivering an event even when a network form is changed while sharing the event by a plurality of hosts.

This host stores information on an event server in a server information 203, stores a host list for ordering a plurality of hosts in a host list 204, and transmits a generated event to the event server shown in information stored in the server information 203. When transmission of the event to the event server fails, the host updates the information stored in the server information 203 by using a host ordered next to the event server in the host list as a new event server, and transmits the event whose transmission fails to the new event server.