Keyboard apparatus and detection method for status of keys thereof

A keyboard apparatus and a detection method for status of keys thereof are provided. First, first lines of a key module in the keyboard apparatus are driven to a first potential. Whether any key corresponding to each of second lines in the key module is pressed is detected as a first detection result. Next, the second lines are driven to the first potential. Whether any key corresponding to each of the first lines is pressed is detected as a second detection result. Next, one of the first lines is selected sequentially, a press status of each key corresponding to the selected first line is scanned through the second lines, and a coarse scan result is generated. The press status is obtained and whether the press status is error is determined according to the first detection result, the second detection result and the coarse scan result.