PROBLEM TO BE SOLVED: To make it possible to perform average unit price transaction regarding credit transaction and derivative transaction.SOLUTION: A securities business supporting system 1 manages contract information on credit transaction and derivative transaction and includes a contract recording unit 31 that receives an input of first contract information in which each transaction is compacted and contracted by an average unit price regarding a plurality of transactions of the same brand on the same day, records it in an average unit price DB 36, and/or receives an input of second contract information in which each transaction is contracted by an agreement unit price regarding each transaction, and records it in an agreement unit price DB 35.SELECTED DRAWING: Figure 1
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