To solve such problems that when a person is accustomed to living depending on an air conditioner, the person may drive the air conditioner in a room unnecessarily though an outdoor temperature is in a comfortable allowable range, or the person may use air conditioner operation in prior before running a vehicle without comparing a room temperature of the vehicle with an outdoor temperature, and in another situation, a person neglects to notice the inside of a water tank until a room temperature becomes abnormal and water temperature management of fishes or the like kept in the tank may be unnecessary.

Temperature measurement values measured on both inside and outside through a shield such as the inside and outside of a room, the inside and outside of a vehicle and the inside and outside of a water tank are presented so as to be compared with each other by analog values and temperature situations on the inside and outside of the shield are intuitively and easily grasped to achieve ecological living.