A displaying method for a portable device is provided. The portable device includes a top body and a bottom body, wherein the top body is stacked on the bottom body. In the displaying method, a relative sliding movement of the top body sliding along a sliding direction corresponding to the bottom body is sensed. A gravity direction of the portable device is sensed. According to a direction relationship between the gravity direction and the sliding direction, a display on the top body displays an operation frame corresponding to the direction relationship.