A device for providing augmented reality (AR) that can accurately detect an object or a text at which a user gazes, and can display an image associated with the detected object or text, and a system for providing AR using the same, and may include at least one display module configured to display an AR content image through a transparent lens, a sensing module configured to generate signals indicative of movement in left, right, up, and down directions, and to generate image data corresponding to a user's gaze direction, a biosensor configured to detect a user's pupil to output a pupil sensing signal, and a control module configured to detect gaze coordinate information based on the pupil sensing signal, and to extract an object or a text corresponding to the gaze coordinate information from the image data to generate AR content data including the extracted object or text.