1. An image analysis device, comprising: a processor configured to acquire image data of a plurality of sequential DSA images of a same object; calculate a parameter value per pixel, using time variation of pixel values at a same region of the object among the plurality of sequential DSA images; generate a single parametric image in which a color in accordance with the parameter value is allocated per pixel corresponding to the same region of the object; and generate a plurality of parametric time phase images from the single parametric image and the calculated parameter value, each pixel of each of the plurality of parametric time phase images having a color converted from the color of a corresponding pixel of the single parametric image, by using the calculated parameter value.