To provide a cash management system in which any obstacle to an actual operation can be prevented by preventing cash from being supplied or collected too much.

A group characteristic preparing and updating part 72 prepares group characteristics by grouping ATM whose inclinations are similar based on the cash information of each ATM(automatic transaction machine) collected by an information collecting part 71, and a knowledge characteristic preparing and updating part 73 prepares knowledge characteristics obtained by generating necessary fund amounts corresponding to the elements of day and date. An inference engine preparing and updating part 74 prepares an inference engine for predicting necessary fund amounts for each day and date for each ATM based on the prepared group characteristics and knowledge characteristics, and a predicting part 76 predicts fund amounts necessary for each ATM based on the prepared inference engine, and calculates the supply amounts or collection amounts of cash of each ATM based on the predicted fund amounts and preliminary amounts, minimum amounts, and maximum amounts set by a setting part 75.