PROBLEM TO BE SOLVED: To provide a creditability investigation system to investigate the creditability of any object precisely, efficiently and quickly. SOLUTION: The creditability investigation system includes a server device 100 and a client system 200 which are connected to each other, wherein the client system 200 is equipped with an index DB 227 in which the index information is accommodated, while the server device 100 is equipped with company information DB 110 in which the creditability information is accommodated while it is related to the index information, a TEL register DB 120, an address register DB 130, and a creditability investigation processing part 141 to acquire the creditability information on the basis of the index information transmitted from the client system 200.
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