Fig. 6 shows an example of audible message application. When a sender tell its voice via microphone on smartphone, the application recodes it. Once recoding is finished, voice data is encoded by a certain speech encoder, and then the encoded voice data is embedded into a JPEG image file. When a recipient receives the JPEG file, the application first decodes JPEG image file and extracts voice data from embedded data area and decodes and playbacks voice data with the original image displayed.