VEHICLE-MOUNTED DEVICE AND SERVER

A vehicle-mounted device installed in a vehicle comprising a mobile terminal communication unit that communicates with a mobile terminal located inside the vehicle, and a control unit that provides an interface for operating the vehicle-mounted device from the mobile terminal, wherein the control unit compares a vehicle interior image taken inside the vehicle interior with a facial image of the user of the mobile terminal and changes the interface provided to the mobile terminal based on the determined seating position of the user. The vehicle-mounted device further comprises a display unit, wherein the control unit causes the mobile terminal to display expanded display details on the display unit if the seating position is in a front seat, and causes the mobile terminal to display the same display details as those on the display unit if the seating position is other than one in a front seat.