Image data is transmitted from an image input apparatus to an information processing apparatus. Specific information (e.g., photographing information) that specifies the image data, and identification information (e.g., a disk name) that identifies an optical disk on which the image data is recorded, are added to the image data. Further, the specific information and the identification information are stored in a storage device. Subsequently, specific information that matches with an input keyword is searched from the specific information stored in the storage device. Then, the searched specific information and the identification information corresponding to the searched specific information are displayed in a list on a display. By performing a keyword adding process and an image searching process, the optical disk containing desired image data can be easily specified. Therefore, desired image data recorded on the optical disk can be easily searched.