An ultrasonic device and a controlling method thereof are provided. The controlling method of the ultrasonic device includes the following steps. A first word string of a first annotation is shown on a touch panel. The first word string is a word, a number, a sign or a combination thereof. If a first touch signal is received at the first annotation, then the first word string is replaced.一種超音波裝置及其控制方法。超音波裝置之控制方法包括以下步驟。於一觸控螢幕顯示一第一標示之一第一字串。第一字串係為文字、數字、符號或其組合。若觸控螢幕於第一標示之位置接收一第一觸碰訊號,則更換第一字串。100‧‧‧超音波裝置110‧‧‧觸控螢幕120‧‧‧處理單元130‧‧‧儲存單元FG‧‧‧手指TG1、TG2‧‧‧標示ST1、ST2‧‧‧字串
