A reset method performs a software reset in a state in which data in a volatile memory is retained, when an abnormality is generated in a monitoring apparatus. Hardware of the monitoring apparatus may include a function to perform a hardware reset in a state in which the data in the volatile memory is retained, but the software reset is performed with respect to the hardware that does not include such a hardware reset function. The volatile memory may store control information for controlling a host computer monitored by the monitoring apparatus, in addition to data including fault check materials to be retained when the fault is generated. The monitoring apparatus may read the fault information from the hardware to judge whether an abnormal value is reached.