A management system includes a first management device storing information regarding: objects monitored by the first management device, objects monitored by a second management device and relationships between objects monitored by the first management device and objects monitored by the second management device. The first management device requests such information from the second management device. Using the information stored by the first management device and the information requested from the second management device, the first management device ascertains at least one relationship between at least one object monitored by the first management device and at least one object monitored by the second management device and which is stored either just by the first management device or just by the second management device.