Patent ID: 8594886

Claim:
A car-mounted information apparatus acted by electric power supplied from a battery of an electric car, which the battery is charged when an accessory switch of the electric car is in an OFF state, comprising: an updatable data storage unit storing updatable data; a communication address data storage unit storing a communication address datum corresponding a predetermined information management apparatus arranged outside the electric car; a charge state judge unit judging whether or not the battery is in charging when an accessory switch of the electric car is in OFF state; a radio communication unit communicating between the information management apparatus, to which the communication address datum corresponds, by the electric power supplied from the battery in charging; and a control unit controlling the radio communication unit to execute at least one action of transmitting the updatable data and receiving update data for updating the updatable data between the information management apparatus when the charge state judge unit judges that the battery is in charging; an update unit acted by the electric power from the battery in charging, and updating the updatable data according to the update data received by the radio communication unit; and a voltage value decrease detecting unit detecting decrease of voltage value at the terminal of the battery when the charge state judge unit judges that the battery is in charging, wherein the charge state judge unit analyzes change of voltage value at a terminal of the battery, and judges whether or not the battery is in charging based on an analyzed result, wherein the radio communication unit is enabled to communicate by radio between the information management apparatus shown by the communication address datum, according to judging, which is judged by the charge state judge unit that the battery is in charging, wherein the control unit controls the radio communication unit to transmit a notification datum for disabling radio communication between the information management apparatus toward the information management apparatus when the decrease of voltage value is detected by the voltage value decrease detecting unit.