A method for displaying a screen in a mobile device, the method comprising: displaying a list of items in a display form, wherein, in the display form, the items are arranged in a three-dimensional form, viewed from a side, or in a three-dimensional form, viewed from the side with an inclined angle; receiving a command for altering the display form of the list of items; altering the display form to an altered display form, wherein, in the altered display form, the items are arranged in the three-dimensional form, viewed from above; and displaying the list of items in the altered display form; wherein displaying the list of items in the display form comprises displaying only part of the list of items; wherein displaying the list of items in the altered display form comprises displaying the entire list of items; wherein altering the display form comprises: determining a number of indexes, N, contained in a list of items; comparing the number of indexes, N, contained in the list of items with a number of indexes, M, that can be displayed on one screen; and displaying, when N is equal to or less than M, the N indexes in a preset order; and wherein displaying the N indexes comprises: detecting a number of items classified by respective indexes; determining sizes of regions of the altered display form corresponding to the respective indexes according to the detected number of items; and allocating the determined sizes of regions to the N indexes, in the preset order, and displaying the N indexes according to the allocation. displaying a list of items in a display form, wherein, in the display form, the items are arranged in a three-dimensional form, viewed from a side, or in a three-dimensional form, viewed from the side with an inclined angle; receiving a command for altering the display form of the list of items; altering the display form to an altered display form, wherein, in the altered display form, the items are arranged in the three-dimensional form, viewed from above; and displaying the list of items in the altered display form; wherein displaying the list of items in the display form comprises displaying only part of the list of items; wherein displaying the list of items in the altered display form comprises displaying the entire list of items; wherein altering the display form comprises: determining a number of indexes, N, contained in a list of items; comparing the number of indexes, N, contained in the list of items with a number of indexes, M, that can be displayed on one screen; and displaying, when N is equal to or less than M, the N indexes in a preset order; and determining a number of indexes, N, contained in a list of items; comparing the number of indexes, N, contained in the list of items with a number of indexes, M, that can be displayed on one screen; and displaying, when N is equal to or less than M, the N indexes in a preset order; and wherein displaying the N indexes comprises: detecting a number of items classified by respective indexes; determining sizes of regions of the altered display form corresponding to the respective indexes according to the detected number of items; and allocating the determined sizes of regions to the N indexes, in the preset order, and displaying the N indexes according to the allocation. detecting a number of items classified by respective indexes; determining sizes of regions of the altered display form corresponding to the respective indexes according to the detected number of items; and allocating the determined sizes of regions to the N indexes, in the preset order, and displaying the N indexes according to the allocation.