A fastening apparatus includes a body; a fastener movably disposed at the body; and a resilient component disposed at the body, the resilient component having an end abutting against the body and another end abutting against the fastener such that the resilient component allows the fastener to be protruded from or inserted into the body normally, or the fastener in rotation and the resilient component interact with each other to effectuate limiting-stopping, interfering-stopping or interfering-abutting. The fastener enters the body disposed on the first object and compresses the resilient component. Then, the resilient component protrudes the fastener out of the body, thereby fastening the fastener to the second object quickly. Easy separation of the first and second objects entails moving the fastener into the body. A fastening method for the fastening apparatus is further introduced.