In an apparatus for monitoring devices connected to a network, an event collecting part collects each event received from the devices and controls an event table to maintain device information when the event indicates a problem. A problem alarm notifying part determines, based on dependent information maintained by a relationship object maintaining part, whether or not each of the devices identified by the device information maintained in the event table influences another device by the problem, and specifies which device is causing the problem in accordance with a result of the determination.