1. A disclosure range determination method that determines whether or not there is an error on a range in which data shared by a plurality of users is disclosed, the method comprising: accepting a disclosure range of data and metadata of the data; extracting attribute information of a user that belongs to the disclosure range of the data accepted in the accepting based on association information associating a disclosure range of data with attribute information of a user that belongs to the disclosure range; converting the metadata accepted in the accepting into a keyword based on association information associating a conversion rule that converts the metadata into significant information with a keyword corresponding to the conversion rule; and determining, by a computer, whether or not a user that belongs to the disclosure range accepted in the accepting qualifies for the disclosure range accepted in the accepting, based on whether or not the keyword converted in the converting is included in the attribute information extracted in the extracting.