1. A data managing method comprising the steps of inputting data; extracting, from said input data, data identification information for identifying the data; receiving the input of user identification information for identifying a user; determining whether or not processes for said input data are permitted for the user identified by said acquired user identification information, by referring to permission data; and forbidding the execution of output processes for said input data in the case where it has been determined in said determination step that said processes are not permitted, wherein said permission data is data which associates, for each data identification information, user identification information with process identification information for identifying processes permitted for the data.