In the past several years, some estimating methods of demand on graves were proposed and contributed to the actual planning. Although they are very simple and easy to understand, we have some difficulty to adapt them in recent years since the characteristic of demand are very diversified. In this paper we propose a method to estimate the demand on graves by using the idea of the relevant tree. Using this method, we can not only estimate the amount of demand, but also classify them into some demand-types according to the characteristic.
