A data processing system (S) is configured so as mutually register transmission destinations between devices performing communication. In addition, the data processing system (S) performs a predetermined communication procedure for communicating predetermined information to transition to a communication connection state establishing a mutual communication connection, and in the communication connection state, performs intermittent periodic communication every predetermined interval, where the communication connection state is maintained while periodic communication is maintained, and the communication connection state is released in a case of the periodic communication being interrupted, and in the state in which the communication connection state is released, controls the allowance of transition to the communication connection state again, according to a change state of contents of the predetermined information sent upon transitioning to the communication connection state, and the presence of a transmission destination recorded.