The present invention relates to a screen arrangement method and a character input method of a smartphone keyboard that can be input with one hand thumb, and the keyboards are arranged in an arc shape that is a shape of a thumb movement radius, and the configured keyboards are grouped on the basis of common points. By sorting, the first click selects and enters the grouped character folder, and the second click selects the character to be input from among the rearranged characters in the character folder, thereby entering characters through a relatively small number of keys. The present invention relates to a method of arranging a keyboard screen and a method of inputting a character to make it possible to reduce typos and fatigue when inputting text with one hand.
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