| 摘要 |
PROBLEM TO BE SOLVED: To enhance the operability of a user interface function in a system where sound of a mobile audio device is outputted by an on-vehicle audio device. SOLUTION: A headphone terminal of a mobile audio device is connected to an AUX terminal of an on-vehicle audio device. Thus, communication of display information and operation information signal can be attained as user interface information. Then in the on-vehicle audio device, an operation information signal in response to an operation applied to its own operation section is outputted to the mobile audio device to control it. Furthermore, based on display information outputted from the mobile audio device, the operating state of the mobile audio device is displayed by its own display section. Thus, the user interface function of the mobile audio device can be realized by the on- vehicle audio device.
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