A group information generating system 1 comprises a group border information generating units 9 or 10 and a group information generating unit 12. The group border information generating unit 9 or 10 is configured to generate a border information indicating at least one border of group when medical images sorted into the group are to be indicated according to an information included in a medical image information. The group information generating unit 12 is configured to generate a group information according to the border information. The group information means a discernment information of the group to which an image indicating information included in the medical image information for indicating one of the medical images is belong.