1. An around view system, comprising: a display module; a camera module configured to generate photograph images of areas surrounding a vehicle; and a control module configured to output an around view monitoring (AVM) combined image obtained by combining the surrounding images to the display module, wherein the control module comprises: a generating unit configured to generate the AVM image by converting a view of the surrounding image; a recognizing unit configured to recognize a one or both of a first parking line and a second parking line positioned at either or both sides of a center line of the vehicle according to the AVM image; and a control unit configured to virtually generate a third parking line parallel to the first parking line and generate the AVM combined image obtained by combining the third parking line and the AVM image when recognizing only the first parking line that is a parking line positioned at any one side based on the center line of the vehicle, and wherein the recognizing unit comprises: an image converting unit configured to convert the AVM image into a gray image; a top-hat filter configured to extract characteristic points by using at least one of a luminance deviation and a brightness deviation of the gray image; and a parking line recognizing unit configured to extract line components from the characteristic points, and recognize the parking lines displayed in a targeted parking section displayed in the gray image.