A Nordic walking pole has a transmission device attached thereto and a switch thereof is pushed to transmit a signal indicating the start or end of Nordic walking. A pedometer receives the signal from the transmission device to thereby detect that the start or end of Nordic walking is instructed (S107). Assuming that the Nordic mode is specified when the current walking mode is a normal walking mode, the parameter for Nordic walking is set as a parameter for the arithmetic operation (S111). Assuming that the normal walking mode is specified when the current walking mode is a Nordic mode, the parameter for the normal walking mode is set as a parameter for the arithmetic operation (S113).