When a music file is played back as a piece of music, a CPU obtains date and time information associated with a music file to be played back, searches among image files memorized in a memory for an image file with which date and time information corresponding to the date and time information is associated, and causes a display unit to play back the searched image file while the music file is being played back. In addition, when an image file is played back as an image, the CPU searches among music files memorized in the memory for a music file with which date and time information corresponding to date and time information associated with an image Pile to be played back is associated, and causes a speaker to play back the searched music file while the image file is being played back.