PROBLEM TO BE SOLVED: To quantitatively provide a period profit and loss, which serves as an index for evaluating a performance of managing a financial asset for each customer account, using a simple configuration.SOLUTION: Included are data acquisition units 110 and 130 which acquire time-sequential account data items for each customer, and acquire dealing data items that have occurred for the account over a predetermined period, a correction value calculation unit 150 that calculates a first correction value on the basis of receipt-of-money data or warehousing data out of the acquired dealing data items, and calculates a second correction value on the basis of disbursement data or delivery data out of the acquired dealing data items, a criterion customer data production unit 160 that retrospectively applies the first correction value to time-sequential account data items, which are acquired before the time point when receipt of money or warehousing occurs, out of the time-sequential account data items, and forwardly applies the second correction value to time-sequential account data items which are acquired after the time point when disbursement or delivery occurs, and a memory control unit 180 that stores in a memory unit the time-sequential account data items, to which the first and second correction values are applied, as reference time-sequential account data items.SELECTED DRAWING: Figure 9
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