A monitoring target apparatus connected to a plurality of monitoring manager apparatuses is characterized in that the monitoring target apparatus includes, in a memory, a monitoring agent for collecting monitoring information from monitoring target resources among resources constituting the monitoring target apparatus; and monitoring condition management information that defines an event issuance condition for each type of the monitoring target resources; wherein the monitoring agent judges whether to issue an event or not, based on the monitoring information and the monitoring condition management information; and if the monitoring agent issues the event, it transmits the issued event to all the plurality of monitoring manager apparatuses.