Abstract: A battery management apparatus including a microprocessor configured to perform acquiring a battery information on batteries, acquiring a battery requirement information required by a user, and extracting a candidate battery satisfying the battery requirement as a candidate for a presentation battery from among the batteries based on the battery information and the battery requirement information. The battery information includes a battery element information on each of battery elements included in a first battery and a second battery, and the microprocessor is configured to perform the extracting including determining whether it is possible to constitute the candidate battery by a combination battery including the battery elements included in the first battery and the second battery, and when it is determined that it is possible to constitute the candidate battery by the combination battery, extracting the combination battery as the candidate battery.

Abstract: Disclosed is a channel control system for controlling data transfers between a main storage and input/output devices. A plurality of channels are controlled by a common controller. The controller divides the processing for data transfer requests into a plurality of processing stages to allow the corresponding number of the channels to be controlled simultaneously by executing the processing for different channels separately at the divided individual processing stages.