In a touch panel system (1) of the present invention, a stylus pen (3) produces output that indicates that a quantitative characteristic value is increased from the characteristic value of a previous output by using a waveform that corresponds to an (L+1)-th drive line (DLL+1) other than L numbers of drive lines (DL1 to DLL) and, meanwhile, produces output that indicates that the quantitative characteristic value is decreased from the characteristic value of the previous output by using a waveform that corresponds to an (L+2)-th drive line (DLL+2) other than the L numbers of drive lines (DL1 to DLL). A touch panel controller (10) includes a conversion output unit (19) that converts and outputs the quantitative characteristic value by using the sum of the initial value of the quantitative characteristic value and the number of outputs × the unit amount of increase or decrease in the waveform that corresponds to the (L+1)-th drive line (DLL+1) or in the waveform that corresponds to the (L+2)-th drive line (DLL+2).