A computer-implemented thumbnail image browsing method for a mobile communication terminal, the method comprising: receiving an original image upon an image receiving event comprising at least one of image downloading, image photographing, and e-mail reception; comparing a width of the original image and a length of the original image; and generating a trimmed image by performing a trimming operation on at least one of an upper border, a lower border, and side borders of the original image according to the comparison; characterized by further comprising the step of: generating a thumbnail image from the trimmed image for display during thumbnail image browsing such that the dimensions of the thumbnail image are relatively smaller and directly proportional to the respective dimensions of the trimmed image, wherein the original image has a width X and a length Y, and m is a value greater than zero, and wherein borders of the original image are trimmed to produce the trimmed image based on the orientation of the original image such that: the original image is trimmed along its length, if X < Y such that: if mY < (Y-X), then the upper border of the original image is trimmed by mY, and the lower border of original image is trimmed by mY-X in order to produce the trimmed image; and if mY > (Y-X) then the lower border of the original image is trimmed by Y-X to produce the trimmed image; and if X > Y, then the side borders of the original image are each trimmed by m(X-Y) each to produce the trimmed image. receiving an original image upon an image receiving event comprising at least one of image downloading, image photographing, and e-mail reception; comparing a width of the original image and a length of the original image; and generating a trimmed image by performing a trimming operation on at least one of an upper border, a lower border, and side borders of the original image according to the comparison; generating a thumbnail image from the trimmed image for display during thumbnail image browsing such that the dimensions of the thumbnail image are relatively smaller and directly proportional to the respective dimensions of the trimmed image, wherein the original image has a width X and a length Y, and m is a value greater than zero, and wherein borders of the original image are trimmed to produce the trimmed image based on the orientation of the original image such that: the original image is trimmed along its length, if X < Y such that: if mY < (Y-X), then the upper border of the original image is trimmed by mY, and the lower border of original image is trimmed by mY-X in order to produce the trimmed image; and if mY > (Y-X) then the lower border of the original image is trimmed by Y-X to produce the trimmed image; and if X > Y, then the side borders of the original image are each trimmed by m(X-Y) each to produce the trimmed image. the original image is trimmed along its length, if X < Y such that: if mY < (Y-X), then the upper border of the original image is trimmed by mY, and the lower border of original image is trimmed by mY-X in order to produce the trimmed image; and if mY > (Y-X) then the lower border of the original image is trimmed by Y-X to produce the trimmed image; and if mY < (Y-X), then the upper border of the original image is trimmed by mY, and the lower border of original image is trimmed by mY-X in order to produce the trimmed image; and if mY > (Y-X) then the lower border of the original image is trimmed by Y-X to produce the trimmed image; and if X > Y, then the side borders of the original image are each trimmed by m(X-Y) each to produce the trimmed image.