Separated keyboard and method for changing keyboard layout for each communication connection

A separated keyboard device, comprising:

• a main keyboard unit connected to a digital processing device by wire or wirelessly;
• and
• a sub keyboard unit physically separated from the main keyboard unit and connected to the main keyboard unit by wire or wirelessly,
• wherein a first keyboard layout for an operation in one-handed mode is applied when the sub keyboard unit is not connected while the main keyboard unit is connected to the digital processing device, the first keyboard layout defining a first logical arrangement of how each of a plurality of keys on the main keyboard unit corresponds to an associated letter,
• wherein a second keyboard layout for an operation in two-handed mode is applied to the main keyboard unit and the sub keyboard unit when the sub keyboard unit is connected while the main keyboard unit is connected to the digital processing device, the second keyboard layout defining a second logical arrangement of how each of a plurality of keys on the main keyboard unit corresponds to an associated letter, the second logical arrangement being different from the first logical arrangement,
• wherein the plurality of keys of the main keyboard unit are arranged to form a plurality of blocks when the main keyboard unit corresponds to the user's right hand,
• wherein the plurality of blocks comprises
• a main block consisting of a first plurality of the plurality of keys,
• a first outer block consisting of a second plurality of the plurality of keys, arranged adjacent to the right side of the main block at a lower side relatively closer to the user side than the main block,
• a second outer block consisting of a third plurality of the plurality of keys, arranged adjacent to the right side of the first outer block at a lower side relative to the first outer block,
• an inner block consisting of a fourth plurality of the plurality of keys, arranged adjacent to the left side of the main block at a lower side relative to the main block, and
• a lower block consisting of a fifth plurality of the plurality of keys, arranged at lower sides of the inner block and the main block, the fifth plurality of keys corresponding to a movement path of a thumb are arranged in a curved shape,
• wherein a touchpad is arranged below the main block and the first outer block and on the left side of the lower block.