Writing gesture notification method and electronic system using the same

A writing gesture notification method, applied to an electronic device of an electronic system, the electronic system includes the electronic device and an input device, the writing gesture notification method comprising:

• obtaining input information from the input device;
• obtaining first contact information and orientation information of the input device from the input device;
• obtaining second contact information via the electronic device, wherein the second contact information includes at least two contact positions where two portions of a hand of a user directly contact the electronic device when the user operates the input device using the hand to write on the electronic device;
• comparing the input information, the first contact information, the orientation information and the second contact information with preset information to generate a comparison result;
• and
• providing a notification via the electronic device according to the comparison result.