A method for providing an Advanced Pedestrian Assistance System to protect a pedestrian preoccupied with a smartphone is provided. The method includes steps of: the smartphone instructing a locating unit to acquire 1-st information including location and velocity information of the pedestrian and location and velocity information of the smartphone; instructing a detecting unit to acquire 2-nd information including hazard statuses of hazardous areas near the pedestrian and location information and velocity information of hazardous objects, by referring to images acquired by phone cameras linked with the smartphone and the 1-st information; and instructing a control unit to calculate a degree of pedestrian safety of the pedestrian by referring to the 1-st and the 2-nd information, and to transmit a hazard alert to the pedestrian via the smartphone. Further, the method can be used for surveillance or a military purpose.