A communication apparatus which, in a process for establishing a wireless communication, lowers power consumption and at the same time, saves a user from having to perform operation. A first communication unit receives a signal sent from an external apparatus using a first communication system. A second communication unit communicates with another communication apparatus different from the external apparatus using a second communication system different from the first communication system. When the signal received from the external apparatus by the first communication unit is a signal from a predetermined external apparatus, control is provided to send a signal for starting a communication unit of the other communication apparatus, which carries out communications using the first communication system, to the other communication apparatus using the second communication unit. The first communication system may be Wireless Lan (LAN), the second communication system may be Bluetooth Low Energy (BLE).