The invention discloses a network information processing system and an information processing method thereof, and the system comprises an information issuing and processing device, a payment shipping device and a using information storage device. The method comprises the steps that: information of digital commodities and the number of the commodities are issued, the using information of the digital commodities is stored in a database; a purchase command is received, a corresponding order is further generated, when the number X of the commodities which can not generate the order is not more than the preset number, the corresponding digital commodities are set as the non-purchasable state; payment information of the order of the digital commodity is received, the using information of the purchased digital commodity of the order is obtained from the database and is automatically sent to a terminal of a payment party, when the number Y which can not emit the using information from the current database is nor more than the preset number, the corresponding digital commodities with the number are set as non-purchasable state. The usage of the invention can realizie the automatic shipping of the digital commodities, and save the storage and calculation resources of the system, reduce the times of human-computer interaction and facilitate the user operation at the same time.