Power information management device and power information management system

A power information management device communicable with at least one other device and being able to perform one of mutual power supply and unidirectional power supply, comprising:

• a processor that sends a power-profile request to the at least one other device, requesting transmission of the power profiles, each specifying a value of electric power the power information management device is allowed to request the at least one other device to transmit, and no greater than the difference between the electric power supplied to the power information management device and the operating power of the power information management device,
• the processor receiving the requested power profiles from the at least one other device in response to the sending of the power-profile request,
• wherein the power profiles relate to power information of a plurality of devices including the power information management device and the at least one other device, and
• wherein the received power profiles include at least one of:
• a ratio between a full charge capacity of one device of the plurality of devices and a sum of residual quantities of electric power of each device of the plurality of devices, and
• a ratio between a full charge capacity of one device of the plurality of devices and a sum of residual quantities of electric power of the plurality of devices other than one device;
• the processor selecting one of the received power profiles as an optimal power profile based on a current operating mode or a current status of the power information management device;
• the processor sending a request to the at least one other device for the transmission of the selected optimal power profile;
• and
• the processor receiving electric power transmitted from the at least one other device corresponding to the electric power specified in the optimal power profile sent to the at least one other device.