When a client PC receives a request for printing output data, an imaging apparatus captures an image of a user. The image data of the user captured by the imaging apparatus and the output data is transferred to a management server. The management server performs predetermined image processing on the acquired image data, calculates a characteristic amount of the image data of the user, and registers the calculated characteristic amount and the output data by associating with each other. When the user requests printing of the output data from an image forming apparatus, image data of the user captured by the imaging apparatus is transferred to the management server. The management server calculates a characteristic amount of the acquired image data of the user, compares the calculated characteristic amount with the characteristic amount in the management server, and transfers the output data to the image forming apparatus.