is changeable when a folder object is selected a button for changing the size is displayed at for example the lower right portion of the folder object the file object can be used as a file template by marking the section 34 format 34 of document information a file object of a type in which the section 34 format 34 of document information is not marked is operated such that a file indicated by the pointer is simply opened when a user double clicks the file object on the pie folder however in a case where the section 34 format 34 is marked a new file object and a copy of the entity of the file are created and then the copied file is opened the pointer of the thus produced file object indicates the copied file the entity of a file can be shared with a plurality of users a file object having a path to the entity of the shared file has a sharing mark in the form like a person as displayed in the lower left portion of the file 34 pie proposal mr a 34 shown in fig3 though a file being shared name memo and bitmap data are under management.