| 摘要 |
PROBLEM TO BE SOLVED: To provide an operation unit enabling efficient checking of plural item keys in the case of switchover-displaying, for checking, the item keys.SOLUTION: An operation unit 102 includes: determination means 403 for determining whether or not pressing of a switchover-display key is a series of pressing when the switchover-display key for switchover-displaying a selection item key presently displayed on a selection screen to a selection item key not yet displayed on the selection screen is pressed; and display reception means 401 for displaying selection item keys which are not yet displayed on the selection screen and the number of which is larger than the number of displaying that is set for the selection screen in the form of a list so as to be pressed, if the result of determination is that the pressing of the switchover-display key is a series of pressing. |
