Transmitting device and transmitting method

A transmitting device that transmits a FSK-modulated wireless signal to a receiving device, comprising:

• a controller that determines a transmitting content transmitted to the receiving device and a value of a maximum frequency shift in the FSK modulation, and outputs output information including the transmitting content, the value of the maximum frequency shift, and a value of a center frequency in the FSK modulation;
• a generator that generates a FSK modulation signal based on the transmitting content, the value of the maximum frequency shift, and the value of the center frequency, which are output from the controller;
• and
• a transmitting antenna that transmits the FSK modulation signal, which is generated by the generator, in a form of a wireless signal,
• wherein the controller outputs a plurality of pieces of information each of which includes the identical transmitting content, the identical values of the center frequency, and two or more different values of the maximum frequency shifts at different times, when the identical transmitting content is transmitted to the receiving device.