The first bone segment and a second bone segment separated by fracture line or joint, the first bone segment, through a fracture line or joint, by forming an insertion path extending to a second bone segment, fixing or it can be fixed. Anchor body is introduced into the insertion path. Distal portion of the anchor main body is locked to the inner region of the second bone segment. An elongated implant structure through on the anchor body, to extend pass the fracture line or joint between the two bone segments. Proximal end of the anchor body is locked to the external region of the first bone segment in cooperation with the locked above end portion, placing the anchor body in a compressed state. Thereby, both bone segments, along the fracture line or joint, is compressed and fixed. Region to be internal growth or through the growth of bone on the implant structure, to promote the fixing or fixing of the first bone segment and a second bone segment is compressed held and fixed by the anchor body.