1. An information processing apparatus comprising: an image processing unit for smoothing a tissue sample image obtained by staining and then imaging a biological tissue containing parenchymal cells and stromal cells so that luminance values of cell components of each of the parenchymal cells become less than those of each of the stromal cells; and a mask generation unit for generating, through generating a binary image by binarizing the tissue sample image smoothed by the image processing unit, a mask for removing a region of the stromal cells from the tissue sample image, wherein a diagnosis based on the tissue sample image is supported.