Power saving is realized by changing a communication speed of wireless communication according to data. An input means (1a) inputs input data. A priority determination means (1b) determines priority of the data input by the input means (1a). A speed control means (1c) sets the communication speed of the wireless communication of the data to be output from an output means (1d) according to the priority of the data determined by the priority determination means (1b), and also, when input of the data is not detected, sets the communication speed of the wireless communication of the data to be output from the output means (1d) to be lower than the communication speed when the input of the data is detected. The output means (1d) outputs output data by the wireless communication at the set communication speed.