A method to store a document using an image forming apparatus and a system to perform the same. The method to store a document using an image forming apparatus to perform at least one function includes: converting first data indicating a document to be worked on and having a format to perform at least one function in the image forming apparatus to second data indicating the document to be worked on; storing the first data and synchronization information in the image forming apparatus; and storing the converted second data in at least one of the image forming apparatus and an external apparatus connected to the image forming apparatus.