A document processing system includes a first device capable of executing a document processing application, the first device including a first display control unit that controls a first display unit so as to display an electronic document to be processed and plural object attachment buttons, to which attachment commands of plural types of objects attachable to the electronic document are respectively assigned, in the document processing application, and a second device capable of executing the document processing application, the second device including a second display control unit that controls a second display unit having a size smaller than a size of the first display unit so as to display an electronic document to be processed and selection object attachment button to which attachment commands of selection objects, which is an object selected by a user among the plural types of objects corresponding to the plural object attachment buttons, are assigned.