1. A maintenance method for an information processing apparatus, comprising: acquiring, by a processor, 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 from an external storage apparatus; storing, by the processor, the acquired machine information in association with the machine identification information in a database, and storing, by the processor, a setting value of each setting item and a maximum value and a minimum value of the setting value as the setting value information of the machine in the database; acquiring, by the processor, a statistical image which is generated based on the setting value information of a plurality of information processing apparatuses from a server; generating a setting value image determined by the setting value information of the machine based on the machine information stored in the database by a display processing unit, and combining the setting value image with the statistical image by the display processing unit; and displaying the combined image on a display unit.