A method of compensating for distortion in text recognition, the method comprising the steps of: extracting a text region from an image; estimating a straight line approximating the form of an upper end of the extracted text region; estimating a straight line approximating the form of a lower end of the extracted text region; estimating straight lines (43c, 43d) approximating the forms of left and right sides of the extracted text region; estimating a quadrilateral in the form of the estimated straight lines approximating the forms of the upper end, lower end, and left and right sides of the extracted text region, the quadrilateral including a minimum area of the text region; and transforming the text region constituting the estimated quadrilateral into a rectangular quadrilateral using an affine transform, wherein the step of estimating the straight line approximating the form of the upper end comprises: positioning a reference line that simultaneously passes horizontally through individual text regions (31, 32, 34-39) constituting an entire text region, and extracting coordinate values of pixels corresponding to an uppermost end among pixels (31a, 32a, 34a, 35a, 36a, 37a, 38a, 39a) positioned at upper ends that are higher than the reference line; and obtaining a straight line approximating the extracted coordinate values as the straight line that approximates the form of the upper end of the extracted text region, and wherein the step of estimating straight lines (43c, 43d) approximating the forms of the left and right sides comprises: measuring slopes of vertical contours (41a-g, 42a-j) of individual text regions (31, 37-39) positioned on the left and right sides in the extracted text region; and determining the measured slopes of contours (41a-g, 42a-j) of the individual text regions (31, 37-39) having the largest size as slopes of the straight lines (43c, 43d) approximating the forms of the left and right sides. extracting a text region from an image; estimating a straight line approximating the form of an upper end of the extracted text region; estimating a straight line approximating the form of a lower end of the extracted text region; estimating straight lines (43c, 43d) approximating the forms of left and right sides of the extracted text region; estimating a quadrilateral in the form of the estimated straight lines approximating the forms of the upper end, lower end, and left and right sides of the extracted text region, the quadrilateral including a minimum area of the text region; and transforming the text region constituting the estimated quadrilateral into a rectangular quadrilateral using an affine transform, wherein the step of estimating the straight line approximating the form of the upper end comprises: positioning a reference line that simultaneously passes horizontally through individual text regions (31, 32, 34-39) constituting an entire text region, and extracting coordinate values of pixels corresponding to an uppermost end among pixels (31a, 32a, 34a, 35a, 36a, 37a, 38a, 39a) positioned at upper ends that are higher than the reference line; and obtaining a straight line approximating the extracted coordinate values as the straight line that approximates the form of the upper end of the extracted text region, and positioning a reference line that simultaneously passes horizontally through individual text regions (31, 32, 34-39) constituting an entire text region, and extracting coordinate values of pixels corresponding to an uppermost end among pixels (31a, 32a, 34a, 35a, 36a, 37a, 38a, 39a) positioned at upper ends that are higher than the reference line; and obtaining a straight line approximating the extracted coordinate values as the straight line that approximates the form of the upper end of the extracted text region, and wherein the step of estimating straight lines (43c, 43d) approximating the forms of the left and right sides comprises: measuring slopes of vertical contours (41a-g, 42a-j) of individual text regions (31, 37-39) positioned on the left and right sides in the extracted text region; and determining the measured slopes of contours (41a-g, 42a-j) of the individual text regions (31, 37-39) having the largest size as slopes of the straight lines (43c, 43d) approximating the forms of the left and right sides. measuring slopes of vertical contours (41a-g, 42a-j) of individual text regions (31, 37-39) positioned on the left and right sides in the extracted text region; and determining the measured slopes of contours (41a-g, 42a-j) of the individual text regions (31, 37-39) having the largest size as slopes of the straight lines (43c, 43d) approximating the forms of the left and right sides.