Disclosed is an image processing apparatus, which comprises a control section operable, when a communication-possibility determination section determines that it is impossible to communicate with a server apparatus, to store and keep processed sheet number information representing the number of image-processed sheets in a sheet-number storage section in correspondence with user-identification information for identifying each user, and when the communicate with the server apparatus is determined to be possible, to transmit the processed-sheet-number information stored in the sheet-number storage, to the server apparatus in correspondence with the user-identification information. The image processing apparatus makes it possible to reliably manage an accumulated sheet number on the side of the server apparatus, on a user-by-used basis.