To enable a user to easily sell and buy an accidental car in a net auction by developing an accidental car auction on nationwide and global scale and completing assessment information and forwarding information in consideration of problems peculiar to the accidental car.

In the accidental car net auction system consisting of an auction managing and operating site 2 that manages and operates the accidental car auction system and a plurality of member terminal 3 in which a member is registered when prescribed member standards are satisfied by the auction managing and operating site 2 and by which exhibition or bid of the accidental car is enabled and formed by connecting the auction managing and operating site 2 and the member terminal 3 with a network 1, it is provided with an assessment information browsing means to enable the member to browse the assessment information created for the accidental car exhibited from the member terminal 3 by a prescribed assessment system and a forwarding information retrieving means to enable the member to retrieve the forwarding information of the accidental car after establishment of selling and buying.