In a method for intermediating images, user group information concerning at least one user group to which the user belongs is extracted from a user group table recording a relationship between the user and the user group based on the authentication information of a user. The user group information extracted is sent to the user and obtaining information of a selected user group selected by the user and an image corresponding to the selected user group selected by the user is extracted. Then, the image corresponding to the selected user group is sent to the user.