PROBLEM TO BE SOLVED : To realize precise and efficient real estate security management by displaying calculated dividend amounts of a plurality of mortgages for each type.SOLUTION : This real estate security management device is provided with a certified copy classification processing means 12 for comparing processing order for comparison determined in advance with set order of the mortgage in registration to determine as a non-mixture group when the processing order for comparison agrees with the set order, determining as an other company mixture group when the processing order for comparison is different from the set order with respect to mortgage of the other company, and determining as one' s own company mixture group when the processing order for comparison is different from the set order with respect to mortgage of one' s own company and dividend processing means 13, 14, 15 for calculating dividends every group of the non-mixture group, the other company mixture group, and the one' s own company mixture group, updating dividends based on the result of dividend calculation, and calculating dividend of the next group based on the updated dividends.COPYRIGHT : (C)2006, JPO&NCIPI