To dramatically improve measuring speed.

A retrieval unit 53 retrieves an extreme value which is a maximum value or a minimum value from among first measured values measured at measuring points set at a first interval in a frequency direction. A measurement control unit 52 controls a measurement unit 31, and causes the measurement unit 31 to perform measurement in a frequency range including the extreme value retrieved from the first measured values, at a predetermined number of measuring points set at a predetermined second interval which is narrower than the first interval. The retrieval unit 53 retrieves an extreme value which is a maximum value or a minimum value from among second measured values measured at measuring points set at the second interval. A quadrant frequency measuring point adding unit 55 sets a predetermined number of measuring points set at a predetermined third interval which is narrower than the first interval, for a frequency range including a quadrant frequency of a frequency of the extreme value retrieved from the second measured values. The present invention can be applied to an impedance analyzer.