68. The computer program product according to claim 67 , further comprising instructions for judging whether or not predetermined user operation is performed, wherein the predetermined user operation includes operation for canceling the switching of the onscreen representation, and wherein the switching of the onscreen representation if 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.
68. The computer program product according to claim 67 , further comprising instructions for judging whether or not predetermined user operation is performed, wherein the predetermined user operation includes operation for canceling the switching of the onscreen representation, and wherein the switching of the onscreen representation if 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. 72. The computer program product according to claim 68 , 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 external style sheet and the external script and a second time after the completion of acquisition of the external style sheet and the external script.