ELECTRONIC COMMERCIAL TRANSACTION SYSTEM, ELECTRONIC COMMERCIAL TRANSACTION METHOD, MANAGEMENT DEVICE AND RECORDING MEDIUM ! MAINTENANCE CHARGE CALCULATION TABLE FOR AUTO LEASE WITH MAINTENANCE, MAINTENANCE CHARGE CALCULATION PROGRAM AND COMPUTER-READABLE RECORDING MEDIUM STORING THEM

摘要

PROBLEM TO BE SOLVED: To provide an electronic commercial transaction system capable of speedy transmitting transaction-related document to a user through a network at a low cost while securing reliability of the transaction-related papers prepared for electronic commercial transaction. SOLUTION: In this electronic commercial transaction system, a control device 1 for controlling the electronic commercial transaction and a terminal 2 used by the user are connected through a network N, and the electric commercial transaction is conducted between the control device 1 and the terminal 2. The control device 1 is provided with an image processing part 3 for image-processing the transaction- related documents to be prepared for the electronic commercial transaction and producing an image data, a digital watermark processing part 4 for invisibly burying transaction content data including individual information on the user in the image data produced by the image processing part 3 and producing digital watermark processed transaction-related paper data, and a communication part 5 for transmitting the electronic watermark processed transaction-related paper data produced by the watermark processing part 4 to the terminal 2 through the network N.