A touch panel system can accurately detect a position of an indicator as distinguished from noise, an electronic information device, and an indicator position detecting method are provided. An indicator position detecting portion detects a position of an indicator, which is in contact with or close to a detecting surface P, based on either one of a first or a second capacitance signal. The first capacitance signal is obtained in a first driving mode in which a first drive signal is applied to first signal lines and a first sense signal appearing on second signal lines is applied to a sense signal processing portion. The second capacitance signal is obtained in a second driving mode in which a second drive signal is applied to the second signal lines, and a second sense signal appearing on the first signal lines is applied to the sense signal processing portion.