An apparatus including: an image sensor unit configured to convert a sensed hand-drawn sketch to a digital image, an image display unit configured to visualize the digital image to a virtual hand-drawn sketch, and a controller configured to sense a first hand-drawn sketch being drawn with a first sketching tool having a first sketching characteristics on a first sketching plane, store the sensed first hand-drawn sketch as a first digital image with the first sketching characteristics, visualize the stored first digital image as a first virtual hand-drawn sketch on a second sketching plane, sense a second hand-drawn sketch being drawn with a second sketching tool having a second sketching characteristics on the second sketching plane while the first virtual hand-drawn sketch is visualized on the second sketching plane, and store the sensed second hand-drawn sketch as a second digital image. The second digital image is stored with the first sketching characteristics, when the second hand-drawn sketch is a continued sketch of the first hand-drawn sketch.