An auditing system that stores job history information of a job to be executed by an image forming apparatus may include a setting unit and an acquisition unit. The setting unit sets page filtering conditions. In response to the page filtering conditions including a setting of a ratio of pages containing image data to be acquired to all pages included in the job to be executed by the image forming apparatus, the acquisition unit randomly acquires image data of a number of pages corresponding to the ratio, from the pages included in the job, as the job history information.