IN-VEHICLE TERMINAL

An in-vehicle terminal includes: a measurement unit (36) that measures electric field strengths of radio waves for wireless communication emitted from information terminals located in a vicinity thereof; a main terminal (4) identifying unit that identifies a predetermined main terminal among the information terminals; and a communication unit (36) that establishes wireless communication with the identified main terminal and transmits a first electric field strength for another information terminal than the main terminal (4) measured by the measurement unit, via the wireless communication to the main terminal (4).