An imaging apparatus includes a first communication unit configured to communicate with a control apparatus using a first communication protocol, an imaging unit configured to capture an image of a subject to obtain image data in response to an image capturing instruction from the control apparatus in a controlled state, a second communication unit configured to communicate with an external apparatus using a second communication protocol, and an activation unit configured to activate a function of receiving access using the second communication protocol from the external apparatus and transmitting the image data stored in the storage medium to the external apparatus.