A control apparatus includes a first processor that is operative to perform outputting first data including control data, a first input/output interface that receives the first data, a second input/output interface that receives and outputs data, a third input/output interface that receives and outputs data using a second communication method, in which transmission speed is lower than transmission speed in the first communication method, and a second processor that is operable to perform controlling the second input/output interface outputs third data, which is obtained by replacing the control data included in the first data received by the first input/output interface with second data received by the third input/output interface, to a control target apparatus, controlling the control target apparatus outputs the third data received from the second input/output interface, and controlling the third input/output interface outputs response data in response to the third data received from the control target apparatus.