1. A moving image file producing method comprising: capturing, by an electronic camera, one still image; storing, by the electronic camera, the one still image and a reduced image corresponding to the one still image into a non-transitory recording medium; producing, by the electronic camera, a scenario information containing information representing a video effect for displaying the one still image; enabling, by the electronic camera, playback of the one still image by using the scenario information and the reduced image in the electronic camera; inputting, by a computer, the scenario information from the electronic camera; requesting, by the computer, the electronic camera based on the scenario information to send an image material including the one still image; inputting, by the computer, the image material from the electronic camera; requesting, by the computer, the electronic camera based on the scenario information to send a music material; inputting, by the computer, the music material from the electronic camera; determining, by the computer, whether a memory unit of the computer stores a high-sound-quality music material corresponding to the music material input from the electronic camera; selecting the music material input from the electronic camera, or the high-sound-quality music material stored in the memory unit of the computer instead of the music material input from the electronic camera if the computer determines that the high-sound-quality music material is stored in the memory unit of the computer; converting, by the computer, data of the one still image included in the image material and audio data included in the selected music material into data of a moving image in which the one still image is shown dynamically, based upon the video effect defined for the one still image, the data of the moving image having a moving image file format; writing, by the computer, the converted data of the moving image into a moving image file that enables playback of the data of the moving image without processing the data of the one still image in real time; and storing, by the computer, the moving image file into the memory unit of the computer in advance to be used for playback later.