A method performed by a digital device including a touch interface display apparatus to simultaneously process files displayed thereon, including providing a file list in a first direction, at least a part of information of each file are displayed in a second direction, tracing a first user input on a first file in the second direction, displaying a command selection GUI on a path of the movement, detecting a stop position of the movement and determining a command corresponding to one of the command icons where the movement stopped as an execution command, and tracing a second user input including a movement of a user touch from the one of command icons in the first direction, detecting a stop position of the movement in a second file of the plurality of files, and executing the execution command for the first file, second file, and files displayed therebetween.