An electronic control unit (11) of a drive assist apparatus (10) acquires electric power source identification information for identifying a source of an electric power currently charged in a battery and electric power amount information representing an electric power amount corresponding to the source from an electric power acquisition unit (14), thereby recognizing a battery remaining amount SOCrg representing a green electric power, a battery remaining amount SOCj representing a privately generated green electric power, and a battery remaining amount SOCrs representing a non-green electric power. The unit (11) presents travelable ranges each formed by connecting a group of maximum reachable points to which a PHV can reach by using each of a battery total remaining amount SOCr and the battery remaining amounts SOCrg, SOCj, and SOCrs to a user (driver) by using an information presentation unit (12).