A computer readable medium has a consumables-usability determination program product stored thereon. The program product directs a portable terminal to perform as: a model-information inputting section for inputting model information indicating a model of an image forming apparatus; a consumables-information inputting section for inputting consumables information indicating consumables; a first determining section for determining whether the consumables indicated by the consumables information inputted by the consumables-information inputting section is usable to the model indicated by the model information inputted by the model-information inputting section; and a first reporting section for reporting a result determined by the first determining section to the user.