A text input method is implemented in a device with a plurality of keys. If a first key is activated by a first touch operation, one character in a first character set associated with the first key is selected as a first character. If a second key is activated by a second touch operation one character in a second character set associated with the second key is selected as a last character. Each of the first and second touch operations includes a press, a touch track, or a combination of a press and a touch track on a key. An auto-completed word is generated based on a database of words in response to the second touch operation. The auto-completed word includes the first character as a leftmost character of the auto-completed word and the last character as a rightmost character of the auto-completed word.