In a system including a storage battery, primary use side equipment for using the battery, a management server for managing and/or reserving condition of use and histories, etc., in primary use of the storage battery, and re-use side equipment for re-using the storage battery, a condition of use when the storage battery is primarily used, and/or history thereof, etc., are recorded in the management server, and the re-use side equipment obtains the use condition and/or the histories, etc., from the management server when re-using, to notify it to a user, and thereby enabling to confirm fluctuations of performances or capacities of the storage battery, which is generated depending on the use condition when it is used primarily, when re-using the storage battery.