A stent, comprising: a hollow cylindrical stent body formed by weaving at least one first wire made of a super-elastic shape memory alloy such that a plurality of diamond-shaped openings are formed in the cylindrical stent body, and an expanded diameter part which is formed on an end of the cylindrical stent body, with bent portions formed along circumferences of both ends of the cylindrical stent body, wherein the cylindrical stent body is coated with a first medical film; characterized by further comprising: a support stent having an elastic spherical structure and formed by weaving at least one second wire or by threading a plurality of second wires to each other in a zigzag manner such that a hollow hole is formed through a central portion of the elastic spherical structure, wherein the or each second wire is made of a super-elastic shape memory alloy and wherein the support stent is fitted, through the hollow hole, over a circumferential outer surface of the cylindrical stent body behind the expanded diameter part, with coupling wires connecting both ends of the support stent to the cylindrical stent body, wherein the expanded diameter part has a rounded portion on a junction between the expanded diameter part and the cylindrical stent body and is coated with a second medical film, with a removal string ring connected to at least one of the bent portions of the expanded diameter part, wherein the support stent is coated with a third medical film, and wherein in use the rounded portion of the expanded diameter part is caught and supported by an inner surface of a connection tube connected between an esophagus and a stomach of a patient, the support stent is supported by a curved inner surface of a cardiac orifice of the stomach, and a second end of the cylindrical stent body is inserted into a pylorus of the patient via a cavity of the stomach. a hollow cylindrical stent body formed by weaving at least one first wire made of a super-elastic shape memory alloy such that a plurality of diamond-shaped openings are formed in the cylindrical stent body, and an expanded diameter part which is formed on an end of the cylindrical stent body, with bent portions formed along circumferences of both ends of the cylindrical stent body, wherein the cylindrical stent body is coated with a first medical film; characterized by further comprising: a support stent having an elastic spherical structure and formed by weaving at least one second wire or by threading a plurality of second wires to each other in a zigzag manner such that a hollow hole is formed through a central portion of the elastic spherical structure, wherein the or each second wire is made of a super-elastic shape memory alloy and wherein the support stent is fitted, through the hollow hole, over a circumferential outer surface of the cylindrical stent body behind the expanded diameter part, with coupling wires connecting both ends of the support stent to the cylindrical stent body, wherein the expanded diameter part has a rounded portion on a junction between the expanded diameter part and the cylindrical stent body and is coated with a second medical film, with a removal string ring connected to at least one of the bent portions of the expanded diameter part, wherein the support stent is coated with a third medical film, and wherein in use the rounded portion of the expanded diameter part is caught and supported by an inner surface of a connection tube connected between an esophagus and a stomach of a patient, the support stent is supported by a curved inner surface of a cardiac orifice of the stomach, and a second end of the cylindrical stent body is inserted into a pylorus of the patient via a cavity of the stomach. a support stent having an elastic spherical structure and formed by weaving at least one second wire or by threading a plurality of second wires to each other in a zigzag manner such that a hollow hole is formed through a central portion of the elastic spherical structure, wherein the or each second wire is made of a super-elastic shape memory alloy and wherein the support stent is fitted, through the hollow hole, over a circumferential outer surface of the cylindrical stent body behind the expanded diameter part, with coupling wires connecting both ends of the support stent to the cylindrical stent body, wherein the expanded diameter part has a rounded portion on a junction between the expanded diameter part and the cylindrical stent body and is coated with a second medical film, with a removal string ring connected to at least one of the bent portions of the expanded diameter part, wherein the support stent is coated with a third medical film, and wherein in use the rounded portion of the expanded diameter part is caught and supported by an inner surface of a connection tube connected between an esophagus and a stomach of a patient, the support stent is supported by a curved inner surface of a cardiac orifice of the stomach, and a second end of the cylindrical stent body is inserted into a pylorus of the patient via a cavity of the stomach.