To remotely monitor a photovoltaic power generation system having specifications different by delivery model with simple configurations.

A monitored power unit side including a power control power source with a characteristic data detection means, and comprising a battery with a switching means and a photovoltaic power generation panel is provided with an MIB information storage device, a transmission/reception control means, and a communication interface for transmitting and receiving data from a communication line, and an SNMP agent function module to which an OID is attached is provided. On the other hand, the SNMP manager side is provided with: a communication interface, a transmission/reception control means, MIB database storage means, and an MIB database adding means having redundancy and adding information according to the difference of specifications, a display means, a first display control means, a characteristic data decision means and a second display control means, and the SNMP manager side and the agent function module are connected through a communication line, and remotely displayed.