A database analysis apparatus pays its attention to table columns more than two constituting a table among plural tables that a database holds, and analyzes automatically a dependence and a limitation condition that exist between the table columns from a tendency of appearance at the same time of data which each table column maintains, which comprises a data category calculation means to calculate a method of categorizing a data group from association rules generated from the data group of two or more table columns and an association rules reconstruction means to generate association rules of the best granularity by reconstructing the association rules based on the result of the above categorizing.