An image security method and display method of a portable terminal are provided. The image security method includes photographing an image through a camera, storing the image, and storing Subscriber Identity Module (SIM) information of the portable terminal in EXchangeable Image File (EXIF) information of the image. The image display play method includes executing an image view, comparing Subscriber Identity Module (SIM) information of the portable terminal with SIM information within EXchangeable Image File (EXIF) information of an image stored in the portable terminal, and displaying an image depending on the comparison result.