A data processing apparatus is configured to: receive a selection of one of a first function and a second function other than the first function; store, if one device is selected, the selected one device in correlation with the first and second functions; and control a device to execute one of the first and second functions when an instruction to execute one of the first and second functions is received. If no device is stored in correlation with the one of the first and second functions, the selected one device executes the one of the first function and the second function. If another device has been stored in correlation with the one of the first and second functions, one of candidate devices executes the one of the first and the second functions. The candidate devices include the selected one device.