A method and apparatus wherein data generated in a mobile terminal can be classified in an integrated manner based on dates and can be displayed in various forms. User data generated in the mobile terminal can be processed by the mobile terminal or can be sent to and processed by a separate information processing appliance. The data processing method includes executing an integrated data processing application; selecting a reference date; collecting pieces of data created at the reference date regardless of their types; processing the collected pieces of data in an integrated manner according to preset processing conditions; and displaying processing results together with associated screens of the integrated data processing application. The integrated data processing application can be, for example, a life diary application.