2. The method according to claim 1 , further comprising judging whether or not predetermined user operation is performed, wherein the predetermined user operation includes operation for canceling the switching of the onscreen repreentation, and wherein the switching of the onscreen representation is cancelled if it is judged by the judging that the predetermined user operation is performed, and the switching of the onscreen representation is performed if it is judged by the judging that the predetermined user operation is not performed.
2. The method according to claim 1 , further comprising judging whether or not predetermined user operation is performed, wherein the predetermined user operation includes operation for canceling the switching of the onscreen repreentation, and wherein the switching of the onscreen representation is cancelled if it is judged by the judging that the predetermined user operation is performed, and the switching of the onscreen representation is performed if it is judged by the judging that the predetermined user operation is not performed. 6. The method according to claim 2 , wherein the operation for canceling the switching of the onscreen representation is allowed in a certain time period between a first time before completion of acquisition of the definition information and a second time after the completion of acquisition of the definition information.