To provide a function calling device capable of easily and immediately calling a function that has just been used.

When the execution of a function selected through the operation of a function setting switch is complete, a shortcut icon indicating the start of the function is automatically registered on a standby screen. When the shortcut icon registered on the standby screen is operated by the user, the function allocated to the shortcut icon is started. Thus, even if the user has called other unintended function by, e.g., pushing the wrong operating key, the function that has just been used can be easily and immediately called.