A method is disclosed in which water is pumped continuously into one end of a container, the pollutants are captured and floated to the surface, the treated and cleaned water flows out the other end and the floated pollutants are removed. An adjustment amount calculation unit calculates an adjustment amount for the cocking adjustment unit based on the relationship between the boundary lines and the groove lines in a state in which the lenticular lens sheet is overlaid on the plate. In the LS mode, a low duty cycle \u201clink-suspend-packet\u201d is transmitted between periods of silent line state.