In the embodiment of the present invention, and with reference to FIG. 1, the vehicle controller 11 stores a speed level conversion form 51 corresponding to each of the communication channels CH. The speed level conversion form 51 includes multiple connection speed ranges and multiple speed level serials corresponding to the connection speed ranges. For the communication channels CH with already established connections, the vehicle controller 11 is able to determine which one of the speed ranges the real-time connection speed belongs to. The vehicle controller 11 then defines the speed level to be the speed level serial corresponding to the belonged speed range. For example, the speed level conversion form 51 for each of the communication channels CH is listed below. Each of the connection speed ranges corresponds to one of the speed level serials. The speed level serials are represented in numbers. The smaller the numbers representing the speed level serials are, the better the connection speed performances are.
Speed Level Conversion Form
Speed level
Connection speed range (bps)
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