Method and apparatus for ultra low power state in mobile handset

A method and an apparatus for providing ultra power-saving mode in a mobile terminal are provided to minimize the power consumption of a mobile terminal by providing ultra power-saving mode to inactivate the call function according to a user's intention. If the user of a mobile terminal selects ultra power-saving mode(303), the control part of the mobile terminal inactivates the call function(305). Then the control part extracts "k", a DRX(Discontinuous Reception) cycle length coefficient(307). Also the control part determines "Ni", a class specific DRX cycle length coefficient depending on a preappointed value(309). The control part replaces k1 with Ni in order to modify a paging response cycle(311). The control part periodically responds to paging signals according to Ni(313).