A method for setting a machining feed rate of a machine tool for machining a workpiece portion to be machined by a machining means based upon a machining program, comprising the steps of: reading a data of the workpiece portion to be machined; sectionalizing (S40; S45, S100) the workpiece portion in an area corresponding to a work shape of the workpiece portion and determining a shape change point based upon the work shape of the workpiece portion; setting (S40; S200) a machining feed rate for the area and at the shape change point with reference to a predetermined parameter corresponding to an attribute of the sectionalized area and corresponding to an attribute of the determined shape change point, wherein the attribute of the shape change point is determined (S215, S225) corresponding to a bent angle (θ) at the shape change point, wherein the bent angle is determined on the basis of an angle between two straight lines running through respective two of three adjacent points at the shape change point, and the shape change point is categorized (S230c, S230d, S230e) into a plurality of attributes comprising: a first attribute being a first shape change point which is assumed not to have a bent angle and connects a front shape of the first shape change point and a rear shape of the first shape change point, a second attribute being a second shape change point for connecting a front shape of the second shape change point and a rear shape of the second shape change point with a bent angle being equal to or smaller than a first predetermined angle (θg), and a third attribute being a third shape change point for connecting a front shape of the third shape change point and a rear shape of the third shape change point with a bent angle being equal to or greater than a second predetermined angle (θh), and machining the workpiece portion based upon the set machining feed rate. reading a data of the workpiece portion to be machined; sectionalizing (S40; S45, S100) the workpiece portion in an area corresponding to a work shape of the workpiece portion and determining a shape change point based upon the work shape of the workpiece portion; setting (S40; S200) a machining feed rate for the area and at the shape change point with reference to a predetermined parameter corresponding to an attribute of the sectionalized area and corresponding to an attribute of the determined shape change point, wherein the attribute of the shape change point is determined (S215, S225) corresponding to a bent angle (θ) at the shape change point, wherein the bent angle is determined on the basis of an angle between two straight lines running through respective two of three adjacent points at the shape change point, and the shape change point is categorized (S230c, S230d, S230e) into a plurality of attributes comprising: a first attribute being a first shape change point which is assumed not to have a bent angle and connects a front shape of the first shape change point and a rear shape of the first shape change point, a second attribute being a second shape change point for connecting a front shape of the second shape change point and a rear shape of the second shape change point with a bent angle being equal to or smaller than a first predetermined angle (θg), and a third attribute being a third shape change point for connecting a front shape of the third shape change point and a rear shape of the third shape change point with a bent angle being equal to or greater than a second predetermined angle (θh), and a first attribute being a first shape change point which is assumed not to have a bent angle and connects a front shape of the first shape change point and a rear shape of the first shape change point, a second attribute being a second shape change point for connecting a front shape of the second shape change point and a rear shape of the second shape change point with a bent angle being equal to or smaller than a first predetermined angle (θg), and a third attribute being a third shape change point for connecting a front shape of the third shape change point and a rear shape of the third shape change point with a bent angle being equal to or greater than a second predetermined angle (θh), and machining the workpiece portion based upon the set machining feed rate.