A keyboard includes: a key panel that includes: a plurality of keys that are respectively assigned to input characters and symbols, the keys including a specific key that is assigned to input a pair of characters by a single keystroke; and a plurality of switches that are provided for each of the keys to output an electrical signal unique to each of the keys when the keys are pressed; and a controller that detects the electrical signal output from the key panel and outputs a key code corresponding to the electrical signal, the controller being configured to operate to: determine whether the specific key is pressed by detecting the electrical signal; and output multiple key codes including key codes corresponding to the pair of characters when determined that the specific key is pressed.