1. A maintenance method for an information processing apparatus, comprising: acquiring a machine identification information for identifying the machine of the information processing apparatus and a machine information includes a setting value information of a plurality of setting items of a machine and an error information of the machine through an external storage apparatus; associating the acquired machine information with the machine identification information and storing the associated information in a database; acquiring a statistical image which is generated based on the setting value information of a plurality of information processing apparatuses; generating a setting value image determined by the setting value information of the machine based on the machine information stored in the database and combining the setting value image with the statistical image; and displaying the combined image on a display unit.