1. A status estimation apparatus comprising: a detector configured to detect a status change of any of a plurality of electrical devices based on measurement data of a current flowing in a distribution line which supplies power to the plurality of electrical devices; a calculator configured to calculate a current waveform change and a power change which are associated with the status change based on the measurement data; an estimator configured to estimate a candidate originating from the status change based on the current waveform change; and a specifying unit configured to specify an electrical device which has caused the status change and a type of the status change based on the power change and an estimation result of the candidate.