Patent ID: 8593292

Claim:
A household electrical appliance, comprising: an instantaneous electricity rate information receiving unit that receives information of electricity rates which are changed based on power generation capacity and power consumption amount and charged for power consumption as instantaneous electricity rate information; an instantaneous electricity rate information accumulating unit that accumulates the instantaneous electricity rate information received by the instantaneous electricity rate information receiving unit; a reference electricity rate information calculating unit that outputs a result obtained by statistically calculating a plurality of the instantaneous electricity rate information items accumulated by the instantaneous electricity rate information accumulating unit as reference electricity rate information; an electricity rate comparing unit that compares the latest instantaneous electricity rate information received by the instantaneous electricity rate information receiving unit with the reference electricity rate information output from the reference electricity rate information calculating unit; and a notification unit that notifies whether the latest instantaneous electricity rate information is higher than the reference electricity rate information, in accordance with the comparison result of the electricity rate comparing unit.