Abstract: An electric power control support device (101) includes: an electricity consumption receiving unit (102) that receives, from each of devices, operation data indicating a time period during which the device is operating; an electricity consumption history storage unit (103) storing the received operation data; a subordinate-superior relationship determination unit (105) that determines, from the devices, a superior device operating independently and a sub device operating in conjunction with the superior device, based on a temporal position relationship between operating sections temporally overlapping each other; a power-off forgetting determination unit (107) that specifies the sub device operating while the superior device is not operating; and the energy saving support execution unit (108) that supports energy saving for the sub device specified by the power-off forgetting determination unit (107).