PURPOSE: A mission alarm function is provided to offer an effective alarm function to a user by providing a mission to the user. CONSTITUTION: An alarm system is established in a portable terminal(S100). When the alarm system is started(S200), a mission is given to a user(S400). When the mission is not completed, the alarm system is not terminated(S20). When mission is completed, the alarm system is terminated. The user is able to control mission levels in the alarm system.
