A fluorescent image, and either a bright-field image or a phase difference image of a plurality of cells are acquired by a microscope. A position of each cell is specified in the fluorescent image, and then a cell region of each cell is specified using the bright-field image or the phase difference image. A fluorescent part other than the cell region is thereby excluded. A class of each cell is determined, that is, the cells are classified. Thereafter, based on these results, a report is created.