PURPOSE: To provide the article sales registration data processor which can speedily and accurately specify respective external orderers and corresponding articles and is easily handled.

CONSTITUTION: External order data reception control means 11 and 12, externally ordered article registration processing control means 11 and 12, a customer data table 13C, and external order sales data print issue control means 11 and 12 are provided; and external order data including article data and a customer code received from an external data input means 50 can be registered as external order sales data in a sales file 13R and an external order sales data sheet on which customer data corresponding to the article code included in the registered external order sales data and at least article data included in the external order sales data are printed can be issued.