The present disclosure provides an information provision method for providing information on usage of devices in a facility during a power outage. The method includes, upon receiving power outage information indicating that a power outage has occurred in the facility, acquiring remaining power information of a backup power supply installed in the facility, and device information on at least one device 28, 30, 32 that is operable with the backup power supply, acquiring user information of the device 28, 30, 32, determining a usage plan for the device 28, 30, 32 operable with the backup power supply, based on the remaining power information of the backup power supply and the user information, and outputting the usage plan.