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 time phases a plurality of parametric time phase images from the single parametric image and the plurality of sequential DSA images, 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 pixel values of the plurality of sequential DSA images.