Abstract: A device includes a camera for capturing shot images of road surfaces; a sensor for detecting a pedestrian’s movement; a memory for storing record information including a shot image at a preset record point in association with position data of the record point; and a processor for performing an image-based positioning operation by predicting a next record point to be reached by the pedestrian based on the pedestrian’s movement status from detection results of the sensor; extracting a shot image(s) from the shot images stored in the memory based on the predicted record point; comparing the extracted shot image with a real time image captured by the camera for matching; and acquiring the position data of the record point associated with the matching shot image as the position data of the pedestrian’s current position.