According to one embodiment, there is provided a data managing apparatus including: a storage, a power consumption acquiring unit, an information generating unit and a sending unit. The storage stores information on an electricity unit price applied to a customer for each of a plurality of periods of time. The power consumption acquiring unit acquires a history of power consumption for the customer, from a meter apparatus of the customer. The information generating unit sums up the power consumption for ones of the periods of time for which same electricity unit price is applied to generate first information indicating an integrated value of the power consumption for each electricity unit price. The sending unit sends the first information to an external system.