Digital broadcast receiving device, digital broadcast receiving method, and program therefor

A digital broadcast receiving method for a digital broadcast receiving device mounted on a mobile body, wherein the digital broadcast receiving device performs the steps of:

• receiving a digital broadcast wave, demodulating the digital broadcast wave, and outputting a reception state of the digital broadcast wave;
• obtaining mobile body information that is information about the mobile body;
• obtaining a switching threshold that is associated with the mobile body information, from a switching threshold storing means which associates with the mobile body information and stores in advance a switching threshold for switching between plural digital broadcast decoders in accordance with the reception state, the digital broadcast decoders decoding a demodulated signal to output digital broadcast images different from one another;
• and
• making one of the plural digital broadcast decoders, based on the reception state and the obtained switching threshold, decode the demodulated signal, and displaying results of the decoding on a display device.

A program which makes a digital broadcast receiving device mounted on a mobile body operate, the program comprising:

• a mobile body information obtaining function which obtains mobile body information that is information about the mobile body;
• a demodulating function which receives a digital broadcast wave, demodulates the digital broadcast wave, and outputs a reception state of the digital broadcast wave;
• plural digital broadcast decoding functions which decode a signal demodulated by the demodulating function, and which output digital broadcast images different from one another;
• a switching threshold storing function which associates with the mobile body information and stores in advance a switching threshold used in choosing, in accordance with the reception state, which one of the digital broadcast decoders is to decode the signal demodulated by the demodulating function;
• and
• a decoder switching function which consults the switching threshold storing function to obtain a switching threshold that is associated with the mobile body information, makes one of the plural digital broadcast decoders, based on the reception state and the obtained switching threshold, decode the signal demodulated by the demodulating function, and displays results of the decoding on a display device.