An electric storage device management apparatus for monitoring an electric storage device assembly charged and discharged by a charger/discharger, the electric storage assembly including a plurality of electric storage devices connected in series, the electric storage device management apparatus comprising: a voltmeter configured to measure voltages of the electric storage devices, respectively; a discharging circuit provided separately from the charger/discharger and configured to discharge the electric storage devices individually; and a controller configured to determine whether a voltage of each electric storage device has reached a reference voltage (KV1, KV2) during charging or discharging of the electric storage device assembly; characterized by further comprising a memory configured to store discharging time period data including discharging time periods associated with sequential numbers, wherein the controller is further configured to: determine a sequence of the electric storage devices according to time at which the voltages of the electric storage devices reach the reference voltage (KV1, KV2); assign the sequential numbers to the electric storage devices, respectively, according to the sequence; determine discharging time periods for the respective electric storage devices according to the respective sequential numbers and the respective discharging time periods associated with the sequential numbers; and control the discharging circuit to discharge the electric storage devices for the respective discharging time periods. a voltmeter configured to measure voltages of the electric storage devices, respectively; a discharging circuit provided separately from the charger/discharger and configured to discharge the electric storage devices individually; and a controller configured to determine whether a voltage of each electric storage device has reached a reference voltage (KV1, KV2) during charging or discharging of the electric storage device assembly; characterized by further comprising a memory configured to store discharging time period data including discharging time periods associated with sequential numbers, wherein the controller is further configured to: determine a sequence of the electric storage devices according to time at which the voltages of the electric storage devices reach the reference voltage (KV1, KV2); assign the sequential numbers to the electric storage devices, respectively, according to the sequence; determine discharging time periods for the respective electric storage devices according to the respective sequential numbers and the respective discharging time periods associated with the sequential numbers; and control the discharging circuit to discharge the electric storage devices for the respective discharging time periods. determine a sequence of the electric storage devices according to time at which the voltages of the electric storage devices reach the reference voltage (KV1, KV2); assign the sequential numbers to the electric storage devices, respectively, according to the sequence; determine discharging time periods for the respective electric storage devices according to the respective sequential numbers and the respective discharging time periods associated with the sequential numbers; and control the discharging circuit to discharge the electric storage devices for the respective discharging time periods.