A control apparatus controls a supply of power to a second apparatus that operates independently of a first apparatus, and includes a notifying part to make a notification that notifies a need to control the power supplied to the second apparatus if needed, based on a preset timer time and a present time acquired from a Real Time Clock (RTC) within the first apparatus, and a supplying part to supply information related to a time for controlling the power supplied to the second apparatus, based on the notification from the notifying part, wherein the notifying part and the supplying part are operable with a power that makes only limited functions within the first apparatus operable.