EXHIBIT 23.1 CONSENT OF INDEPENDENT AUDITORS We consent to the incorporation by reference in the following Registration Statements of National Processing, Inc. of our report dated January 23, 2002, with respect to the consolidated financial statements of National Processing, Inc. and subsidiaries included in its Annual Report on Form 10-K for the year ended December 31, 2001. Registration Statement Description Shares Registered - -------------------------------------------------------------------------------------------------------------- Form S-8 (333-53345) National Processing Company, Inc. Nonemployee Directors Stock Option Plan 200,000 Form S-8 (333-53347) National Processing Company, Inc. 1996 Stock Option Plan 4,000,000 Form S-8 (333-43556) National Processing Company, Inc. 2000 Stock Option Plan 5,000,000 Form S-3 (333-58958) National City Savings & Investment Plan 60,000 National City Savings & Investment Plan No. 2 National City Savings & Investment Plan No. 3 Pre-Effective Amendment National City Savings & Investment Plan No. 1 to Form S-3 National City Savings & Investment Plan No. 2 (333-58958) National City Savings & Investment Plan No. 3 Form S-8 (333-71534) National Processing. Inc. 2001 Restricted Stock Plan 500,000 POS-AM (333-58958) National City Savings & Investment Plan National City Savings & Investment Plan No. 2 National City Savings & Investment Plan No. 3 /s/ ERNST & YOUNG LLP Cleveland, Ohio February 18, 2002