Methods for editing contents in a touch screen electronic device are provided. One method detects user selection of a plurality of displayed contents to be combined within one contents region, such as a memo. Main contents and sub-contents are determined from the selected contents, based on a predetermined input gesture. The sub-contents are combined with the main contents, where a style of the sub-contents is automatically changed to a style of the main contents. Techniques for separating combined contents are also disclosed.