1. A medical information processing system comprising: a storage configured to store therein a mammography image of a breast of a patient and information indicating an image-taking direction of the mammography image; and processing circuitry configured to set a region of interest in the mammography image; determine a second position of the region of interest according to a distance and a direction from a reference position in a schema that schematically represents a figure of a breast, based on a first position of the region of interest in the mammography image and the information indicating the image-taking direction; and display the schema on which the region of interest is displayed at the determined second position.