The pet buying and selling method executed by the pet buying and selling server comprises: a custom made pet contract money deposit request message upon receipt of a custom made pet purchase application information including a mother pet and a father pet from the custom made pet buyer terminal; In the step of providing to the pet buyer terminal, when receiving payment information of the custom-made pet contract money from the custom-made pet buyer terminal, providing the custom-made pet purchase application information to the corresponding custom-made pet producer terminal Requesting mating of the mother pet and the father pet, receiving information on mating of the mother pet and the father pet from the made-to-order pet producer terminal and providing the information to the made-to-order pet buyer terminal Stage, said custom made Providing the made-to-order pet buyer terminal and the made-to-order brother pet buyer terminal with made-to-order brother pet information generated from mating of the mother pet and the father pet from the producer terminal; And receiving the final selection information of the made-to-order sibling pet from the terminal or processing the transaction upon receiving the made-to-order sibling pet purchase order information from the made-to-order sibling pet buyer terminal. [Selected figure] Figure 1
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