An apparatus for assisting physical movement, the apparatus comprising: a body wearing unit for, in use, being put on a specific body of a user; a strap (200,41) linked to one side of the body wearing unit; a strain sensor (300,51) provided on the strap (200,41) to measure a tension applied to the strap (200,41); a strap driving unit (400,23) linked to the strap (200,41) to wind or unwind the strap depending on rotation; a control unit configured to control the strap driving unit (400,23) based on a measurement value of the strain sensor (300,51); and an encoder to measure rotation data of the strap driving unit (400,23), and wherein the strap driving unit (400,23) is configured to rotate in a stationary state such that a reference tension having a specific intensity is applied to the strain sensor (300,51); and to rotate in a specific direction as the applied tension to the strap (200,41) becomes higher or lower the reference tension depending on movement of a user, and wherein the control unit is configured to set the reference tension and a maximum tension, and the control unit is configured to rotate the strap driving unit (400,23) in a direction of winding the strap (200,41) when the applied tension becomes lower than the reference tension by a threshold value or more; and to rotate the strap driving unit (400,23) in a direction of unwinding the strap (200,41) when the applied tension becomes greater than the reference tension by a threshold value or more, and characterized in that the apparatus for assisting physical movement further comprises: a communication unit to transmit the rotation data to a terminal, and wherein the terminal generates and outputs a body image corresponding to the rotation data. a body wearing unit for, in use, being put on a specific body of a user; a strap (200,41) linked to one side of the body wearing unit; a strain sensor (300,51) provided on the strap (200,41) to measure a tension applied to the strap (200,41); a strap driving unit (400,23) linked to the strap (200,41) to wind or unwind the strap depending on rotation; a control unit configured to control the strap driving unit (400,23) based on a measurement value of the strain sensor (300,51); and an encoder to measure rotation data of the strap driving unit (400,23), and wherein the strap driving unit (400,23) is configured to rotate in a stationary state such that a reference tension having a specific intensity is applied to the strain sensor (300,51); and to rotate in a specific direction as the applied tension to the strap (200,41) becomes higher or lower the reference tension depending on movement of a user, and wherein the control unit is configured to set the reference tension and a maximum tension, and the control unit is configured to rotate the strap driving unit (400,23) in a direction of winding the strap (200,41) when the applied tension becomes lower than the reference tension by a threshold value or more; and to rotate the strap driving unit (400,23) in a direction of unwinding the strap (200,41) when the applied tension becomes greater than the reference tension by a threshold value or more, and the apparatus for assisting physical movement further comprises: a communication unit to transmit the rotation data to a terminal, and wherein the terminal generates and outputs a body image corresponding to the rotation data.