To provide a technology generating a replacement plan for a cash unit reflecting a usage result of each denomination in each ATM.

This system 10 is provided with a result DB 28 storing deposit/withdrawal amount result data of respective bills in an ATM 14, an ATM management DB 30 storing a bill charging amount, a means calculating a current bill residual amount, a means predicting a deposit/withdrawal amount in the future, a means calculating a replacement necessary date and time at which a stock amount lowers below a safety stock amount, a means designating the next replacement date and time of the cash unit, a means calculating transition of the bill residual amount, a means calculating the replacement necessary date and time for each cassette, a means designating a reference charge amount as a charge amount in the next replacement, a means calculating a regulation target amount found by subtracting the safety stock amount from the bill residual amount, a means designating a value found by subtracting the regulation target amount from the reference charge amount as a charge amount in the next replacement, and a means storing the replacement time and date of the cash unit and the next charge amount of each cassette in a replacement plan DB 31.

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