1. An image displaying system comprising an objective body detecting unit which detects a predetermined objective body from an image, a storage unit which stores a detection history comprising a past result of detection of the predetermined objective body and a newest result of detection of the predetermined objective body, and a determination unit which refers to the detection history and determines whether the predetermined objective body is to be handled as detected in the image obtained newest, in which when the predetermined objective body has been detected not less than N times in the M times results of detection including the past results of detection (M≧N), the determination unit determines that the objective body is to be handled as detected in the image obtained newest.