Provided is a method of uploading data to a data server with minimum manipulations and downloading or retrieving the uploaded data by using a user's mobile terminal or a user-designated recipient's mobile terminal. A data upload method used by a computer system includes: monitoring whether a data upload shortcut command is input; selecting an object to be uploaded when an input of the data upload shortcut command is sensed; and transmitting an upload file, which consists of data of the selected object, to a data server.