A communication apparatus which has first and second power consumption states, comprises a detection unit which, by receiving predetermined information from an external apparatus in the second state before connecting to a network, detects an external apparatus in which a predetermined function is available, a connection unit which, in a case where an external apparatus in which the predetermined function is available is detected, causes the communication apparatus to connect to a common network with the external apparatus in which the predetermined function is available; a processing unit which, after connecting to the common network, communicates with the external apparatus in which the predetermined function is available, and performs processing based on the predetermined function, and a transition unit which causes the communication apparatus to transition from the second state to the first state.