An output adjustment ECU includes: a request reception section for receiving an output request of alarm information to a driver from a drive assist ECU; a usefulness determination section for, when the request reception section receives the output request, determining whether or not outputting first alarm information that is the alarm information of which the output request is received is useful for the driver; a content modification section for, when the usefulness determination section determines that the outputting is not useful, modifying a content of the first alarm information to generate second alarm information that is alarm information useful for the driver; and an output execution section for outputting the first alarm information when the usefulness determination section determines that the outputting is useful, and outputting the second alarm information when the usefulness determination section determines that the outputting is not useful. In this manner, appropriate alarm information is outputted.