A service bus system includes: a plurality of first devices each coupled with a client; a plurality of second devices each to perform a service; a first service bus device through which sequences of a session between the first and second devices are communicated, including: a prediction unit to predict one or more other service bus devices through which connection between the first and second devices in a second or later sequence of the session is established; and a transmission unit to transmit information indicating the connection in the first sequence of the session to the one or more other service bus devices predicted; and a second service bus device including: a storage unit to hold the information transmitted from the first service bus device; and a connection unit to establish the connection in the second or later sequence of the session by using the connection information held.