Vehicle-mounted communication device and vehicle communication method

An in-vehicle communication device that transmits and receives a signal through a predetermined communication protocol related to Ethernet (registered trademark) includes: a control circuit that generates transmission data including interrupt data inserted in a frame pitch between Ethernet frames; and a PHY unit having a communication circuit that converts the transmission data generated by the control circuit into a signal and transmits the signal. 一种车载通信装置，通过以太网(注册商标)涉及的预定通信协议来收发信号，车载通信装置包括：控制电路，生成包含中断数据的发送数据，该中断数据插入于以太网帧之间的帧间距；及PHY部，具有将由控制电路生成的发送数据转换为信号并发送的通信电路。