INFORMATION PROCESSING SYSTEM AND MONITORING METHOD

An abnormal state of an allocated task in a processing node is detected correctly without using any resource of the processing node. A power usage statistics storing unit 240 stores a statistical value representing a power usage of the processing node in a state of executing the task. A power usage comparing unit 250 compares a newly collected power usage of the processing node in a state of executing the task with the statistical value representing a power usage of the processing node, which is stored in the power usage statistics storing unit 250, to detect an abnormal state of the task in the processing node.