A state output apparatus includes a power storage device information acquirer configured to acquire power storage device information including a voltage and a current of a power storage device; an integrated current amount calculator configured to calculate an integrated current amount supplied to the power storage device during a period in which the voltage changes from a first voltage to a second voltage between a discharge end voltage and a charge end voltage by charging the power storage device; an integrated current amount comparer configured to compare the calculated integrated current amount with a reference integrated current amount stored in a storage device; and a state outputter configured to output a result of the comparison as information indicating a state of the power storage device.