An analyzing apparatus (1) according to an embodiment includes an acquisition unit (161) and a calculation unit (162). The acquisition unit acquires a plurality of time-series medical images. The calculation unit calculates, for each of image pairs each formed of two medical images included in the medical images, a first index value indicating similarity between image signals in the two medical images. The calculation unit also calculates, on the basis of a plurality of the first index values calculated for the respective image pairs, a second index value corresponding to a statistical value in a time direction of the first index values.
