The embodiment of the invention provides an invoice management system and an invoice management method. The invoice management system comprises a number setting module, a number generating module and a number printing module, wherein the number setting module is used for setting an initial invoice number; the number generating module is used for generating an invoice number of the current invoice by correcting the initial invoice number; and the number printing module is used for printing the invoice number of the current invoice on the current invoice. The method comprises the following steps of: setting an initial invoice number; generating an invoice number of the current invoice by correcting the initial invoice number; and printing the invoice number of the current invoice on the current invoice.