The goal of the present invention is to calculate with high accuracy a numerical value representing skin barrier function in a wide range of skin conditions. Provided is an operation processing apparatus calculates a first variable based on delay time measured using an alternating-current (AC) signal generated by the AC signal generation circuit and a signal applied by an application electrode and passing through skin and stores the first variable calculated by the processor as a calculation result. The operation processing apparatus calculates a numerical value representing the skin barrier function based on the calculation result.
