Server and method for automatic order processing

An automatic order processing server according to an embodiment of the present invention comprises: a chat room managing unit that opens a chat room enabling chatting between a vendor terminal and a customer terminal through a chat server; a message transmission and reception unit that, through the chat room, when a message is received from the customer terminal, provides the message to the vendor terminal, and when a message is received from the vendor terminal, provides the message to the customer terminal; a price negotiation database construction unit that stores price proposal reference data and constructs a price negotiation database; a price negotiation unit that presents an estimate price on the basis of the price proposal reference data stored in the price negotiation database; a message managing unit that, when a message is inputted through the chat room, analyzes the message and determines the type of the message, and automatically generates a response message to the message using the estimate pric