A method is for recognizing a person hailing a public passenger vehicle. The method is implemented by a system including an image capturing device, a processor, and a notification unit. In the method, the image capturing device successively captures images in front of the public passenger vehicle at a fixed rate. The processor determines whether any one of the images has a human body. Afterwards the processor determines whether the human body remains in a predetermined posture for a predetermined duration. When it is determined that the human body remains in the predetermined posture for longer than the predetermined duration the notification unit informs a driver of the public passenger vehicle.