While a memory section is in standby mode, a power supplyinterruption circuit supplies electric power to a memory section only during periods in which a refresh operation is performed in synchronization with a timing of the refresh operation generated by the clock circuit, and interrupts power supply to the memory section during periods in which the refresh operation is not performed. The in-vehicle device includes a notifier for notifying the passenger of a congested state of a charge station candidate. And in case that the one of the functions except the speech function is used during the speech state, the speech state is automatically switched over to the hands-free speech state, by the operation of the controlling section, and the one of the functions is executed with the speech function simultaneously.