To reduce a load for computing processing in a controller.

A CPU part 17 stores in a memory part 16 a vehicle operation speed, temperature and data with each voltage signal of a battery voltage A/D-converted, which are read through a sensor input I/F part 15. The CPU part 17 conducts selection between transmission of the data (frequency data and voltage data) of the voltage signal read from the sensor input I/F part 15 as it is, and transmission of actually observed data, when transmitting the operation speed, the temperature and the each data of the battery voltage, to the controller 2. Since computing processing for finding the actual data based on outputs (voltage signals) in various kinds of sensors is thereby carried out in the CPU part 17 in terminal equipment 1, the load for the computing processing is reduced in the controller 2.