IN-VEHICLE APPARATUS

An in-vehicle apparatus includes a navigator that acquires a current position of an own vehicle and guides the own vehicle along a traveling route, an area information extractor that extracts a communication difficulty area, a vehicle controller that performs traveling auxiliary control on the own vehicle, and a travel information manager that determines a communication state in a traveling direction of the own vehicle and transmits travel information on the own vehicle to the vehicle controller. When the travel information manager determines that the communication difficulty area is located in the traveling direction of the own vehicle, the travel information manager switches a traveling mode to a power-saving traveling mode, and the vehicle controller stops map information from being updated via communication and performs the traveling auxiliary control based on the map information acquired before the entry of the own vehicle into the communication difficulty area.