There is provided an error determination program executed by an information processor included in an electronic apparatus that includes a device installation section capable of installing any one of a plurality of devices having different formats, a host controller acting as an intermediary between the information processor and the device installed in the device installation section, and a storage circuit storing an error determination information table that includes a plurality of pieces of error determination information for determining a presence or absence of any error in a plurality of responses to a plurality of commands from the devices installable in the device installation section, by associating the pieces of error determination information with a combination of the formats of the installable devices and the commands executable by the devices. The program includes instructing the host controller to issue a desired command in the commands executable by the device installed in the device installation section to the installed device; acquiring the error determination information associated with the combination of the format of the installed device and the desired command from the error determination information table; acquiring response content information regarding a content of a response to the desired command from the installed device from the host controller; and determining the presence or absence of any error in the response based on the error determination information and the response content information.