An information output apparatus, comprising: an image acquisition unit adapted to acquire first and second brain images of a subject, the first and second brain images having different imaging dates and times; a brain area division unit adapted to divide each of the first and second brain images into a plurality of brain areas so that three-dimensional information and brain area labels and/or names are associated with each other for all voxels forming the three-dimensional first and second brain images; an image analysis unit adapted to calculate an atrophy rate for each of the plurality of brain areas from comparing the volumes of the plurality of brain areas of the first brain image (B 1) and the second brain image; characterised in that the information output apparatus further comprises: an information processing unit adapted to create a table that stores relevance values between the atrophy rates of the plurality of brain areas and scores for a plurality of test items of a dementia diagnostic test; an input unit adapted to receive an input of brain areas of interest; and an output unit adapted to read and output the relevance value of the plurality of test items corresponding to the brain areas of interest which have a relevance value exceeding a threshold value among the plurality of test items, from the table based on the received brain areas of interest and the table. an image acquisition unit adapted to acquire first and second brain images of a subject, the first and second brain images having different imaging dates and times; a brain area division unit adapted to divide each of the first and second brain images into a plurality of brain areas so that three-dimensional information and brain area labels and/or names are associated with each other for all voxels forming the three-dimensional first and second brain images; an image analysis unit adapted to calculate an atrophy rate for each of the plurality of brain areas from comparing the volumes of the plurality of brain areas of the first brain image (B 1) and the second brain image; characterised in that the information output apparatus further comprises: an information processing unit adapted to create a table that stores relevance values between the atrophy rates of the plurality of brain areas and scores for a plurality of test items of a dementia diagnostic test; an input unit adapted to receive an input of brain areas of interest; and an output unit adapted to read and output the relevance value of the plurality of test items corresponding to the brain areas of interest which have a relevance value exceeding a threshold value among the plurality of test items, from the table based on the received brain areas of interest and the table. an information processing unit adapted to create a table that stores relevance values between the atrophy rates of the plurality of brain areas and scores for a plurality of test items of a dementia diagnostic test; an input unit adapted to receive an input of brain areas of interest; and an output unit adapted to read and output the relevance value of the plurality of test items corresponding to the brain areas of interest which have a relevance value exceeding a threshold value among the plurality of test items, from the table based on the received brain areas of interest and the table.