A controller able to communicate with print devices each of which is configured to print a file on a medium, includes: a storage; a folder specifying unit configured to specify a folder stored in the storage as a print target folder; a destination specifying unit configured to specify one of the print devices as a destination print device; a file analyzing unit configured to analyze a format of each of print target files, which are all files in all hierarchical levels in the print target folder, and to determine whether each print target file is a printable file formats which has one of formats printable by the destination print device; and a transmission unit configured to transmit, to the destination print device, the printable format file.