Patent ID: 8225011

Claim:
An information system comprising: a plurality of devices including resources; and a monitoring apparatus configured to manage monitoring states corresponding to the plurality of devices, wherein each of the monitoring states is selected at least from a monitoring target state and a semi-monitoring target state, wherein the monitoring apparatus is further configured to acquire one of a state value and a performance value of a first resource in a first device whose monitoring state is set to be the monitoring target state, and wherein the monitoring apparatus is further configured to determine whether or not a second device whose current monitoring state is set to be the semi-monitoring target state is changed, and to output information prompting a change of a monitoring state of the second device from the semi-monitoring target state to the monitoring target state, if the second device is changed, wherein the monitoring apparatus is further configured to acquire, after changing the monitoring state of the second device to be the monitoring target state, one of a state value and a performance value of a second resource in the second device, wherein the acquisition of the one of a state value and performance value of the first resource is executed based on a schedule for checking the abnormal state of the first device, and wherein the change of the second device is decided by: acquiring first resource information from the second device at a first timing; acquiring second resource information from the second device at a second timing; and comparing the first resource information and the second resource information.