A medical imaging apparatus comprising: an output device; an X-ray radiator configured for radiating an X-ray to X-ray photograph an object; an image acquirer configured to acquire an image of the object by photographing the object; and a controller configured to control the output device to display the image obtained by the image acquirer and to display, over the image, a top indicator that relates to setting a top limit for an area to be X-ray photographed and a bottom indicator that relates to setting a bottom limit for the area to be X-ray photographed, said controller being further configured to determine a number of partial X-ray photographing operations to be performed on the area between the top and bottom indicators, to partition the area between the top and bottom indicators in the image into equally sized regions based on the determined number of partial X-ray photographing operations, and to control the output device to display at least one guideline that indicates a respective bottom limit for each of the regions, wherein the bottom indicator is the same as the last one of the at least one guideline; characterized by an input device configured to receive a user input that relates to adjusting a position of the top indicator and the bottom indicator on the image; wherein, when the input device receives a user input that relates to adjusting a position of at least one of the top and bottom indicators, the controller is further configured to re-determine the number of partial X-ray photographing operations based on the adjusted position of the at least one of the top and bottom indicators, to repartition the area between the top and bottom indicators into equally sized regions based on the re-determined number of partial X-ray photographing operations, and to control the output device to redisplay the at least one guideline that indicates a respective bottom limit for each of the regions corresponding to the re-partitioned area. an output device; an X-ray radiator configured for radiating an X-ray to X-ray photograph an object; an image acquirer configured to acquire an image of the object by photographing the object; and a controller configured to control the output device to display the image obtained by the image acquirer and to display, over the image, a top indicator that relates to setting a top limit for an area to be X-ray photographed and a bottom indicator that relates to setting a bottom limit for the area to be X-ray photographed, said controller being further configured to determine a number of partial X-ray photographing operations to be performed on the area between the top and bottom indicators, to partition the area between the top and bottom indicators in the image into equally sized regions based on the determined number of partial X-ray photographing operations, and to control the output device to display at least one guideline that indicates a respective bottom limit for each of the regions, wherein the bottom indicator is the same as the last one of the at least one guideline; characterized by an input device configured to receive a user input that relates to adjusting a position of the top indicator and the bottom indicator on the image; wherein, when the input device receives a user input that relates to adjusting a position of at least one of the top and bottom indicators, the controller is further configured to re-determine the number of partial X-ray photographing operations based on the adjusted position of the at least one of the top and bottom indicators, to repartition the area between the top and bottom indicators into equally sized regions based on the re-determined number of partial X-ray photographing operations, and to control the output device to redisplay the at least one guideline that indicates a respective bottom limit for each of the regions corresponding to the re-partitioned area.