1. Information processing system including an image processing apparatus, comprising: an image storing controller for storing first image data obtained by reading a document by an image reader in an image storage unit for auditing the first image data, the document being read by the image reader in order to perform an image processing job by the image processing apparatus; a verifying unit for verifying whether the image storing controller successfully stored the first image data in the image storage unit; a controller for causing execution of the image processing job to be terminated abnormally in response to a result by the verifying unit that the image storing controller did not successfully store the first image data in the image storage unit; an extractor for extracting first text data from the first image data that was successfully stored in the image storage unit; a log data generator for generating log data that shows a log related to the image processing job and that contains the first text data extracted by the extractor; a log data storing controller for storing the log data generated by the log data generator in a log data storage unit.