When a power source of a digital broadcasting receiving apparatus is turned on, a microprocessor executes reading of a Read Data with specifying a Read Slave Address which is set by applying a prescribed electrical potential to an Address Select (AS) terminal, if the microprocessor confirms that an A/D converter (ADC) bit which is contained in the Read Data from a Mixer Oscillator PLL (MOP) IC is a ADC bit which is set by applying a prescribed electrical potential to an ADC terminal, the microprocessor transmits a tuning data of a format which corresponds to the MOP IC in which target channel is specified with specifying a Write Slave Address which is set by applying a prescribed electrical potential to the AS terminal.