A method of blocking network attacks using information included in a packet, and an apparatus thereof are provided. The apparatus includes an input shaft receiving engine drive force, a hydraulic continuously variable transmission driven by the input shaft, a planetary power transmission section combining drive force from the input shaft and output from the hydraulic continuously variable transmission for outputting the combined drive force, and an output rotary member outputting power to a travel apparatus. The first section includes icons having sizes determined by comparing characteristics of associated messages to one or more context values, such as time of day, geographic area, or user profile characteristics. The first control signals are supplied to the first and second branches, and to the selection element for selecting one of the four phase shifted signals at one output in a determined division period.