A method of continuously producing a non-oxide ceramic formed of a metal constituent and a non-metal constituent. A downlink quality estimating section uses the transmission power from a transmission power control section to compare transmission power between the users, and estimates that a terminal with low transmission power has high downlink quality. In yet another aspect, the method includes labeling the product with the substrate. Furthermore, a weight is secured to another end of the support bar, and then, the weight holds the support bar in a substantially vertical direction and grounds the magnet acoustically and virtually, thereby attenuating and suppressing oscillation transmitted from the magnet to the support bar.