A computer apparatus has a type data storing part which stores type data regarding file types set according to models of image forming devices and a data file storing part which stores data files of described file types acquired from the image forming devices. The apparatus receives a selection of the models of The image forming devices with the data files acquired thereby and the data files stored in the data file storing part, and selections of the model of the image forming device outputting the data files, the file types different from the described file types and storage destinations of the data files. When receiving an instruction for a conversion, the apparatus converts the data files stored in the data file storing part into file types different from the described file types and stores them in the storage destinations of the data files.