A vehicle-mountable control device configured to control a vehicle including a charging port for DC power and an auxiliary device includes a determination unit and an information obtainment unit. The information obtainment unit is configured to obtain prescribed facility information about a power feeding facility. The determination unit is configured to permit an auxiliary device driving mode when it is determined that the power feeding facility corresponds to the auxiliary device driving mode based on the facility information, and not permit the auxiliary device driving mode when it is determined that the power feeding facility does not correspond to the auxiliary device driving mode based on the facility information.