To provide a communication apparatus, a program, and a system, effectively reducing power consumption associated with wireless communication between apparatuses.SOLUTION: In a system 1, a communication apparatus includes: a first wireless communication unit configured to transmit and receive a signal used for first wireless communication with another communication apparatus; a second wireless communication unit configured to transmit and receive a signal used for second wireless communication that follows the first wireless communication with another communication apparatus; and a control unit configured to control processing regarding receiving or transmitting of the signal used for at least the second wireless communication. The control unit inputs start timing information regarding start timing of the second wireless communication, which varies in accordance with processing time required for the first wireless communication, to the second wireless communication unit. The second wireless communication unit starts the processing regarding receiving or transmitting of the signal used for the second wireless communication on the basis of the start timing information.SELECTED DRAWING: Figure 1