An image data transmission system includes: a first procedure section includes: a path name acquisition unit that acquires a path name of a file; a directory path name specifying unit that specifies a path name of a directory associated with a character string; a path name conversion unit that converts the character string into the path name of the directory; a converted path name providing unit that provides the converted path name; and an image data providing unit that provides an image data; and a second procedure section comprises: a converted path name acquisition unit that acquires the path name; a data reading unit that reads file data stored in the file; an image data acquisition unit that acquires the image data; and a data processing unit that performs a process of the image data, using the file data and the image data.