An apparatus for changing representation contents on a sub-display of a mobile communication terminal is disclosed. A geo-cost policy is established for that user or mobile device in which rules and conditions according to the available discounts and class of service are defined. The selection unit selects, from among the setting items, a part of the setting items. The second portion is provided with second spring means for abutting against the frame thereby pushing the second portion in a direction away from the frame. Meanwhile, because the computation technique of the present invention is not complicated, the cost is lower when the color interpolation calculation method of the present invention is implemented in image signal process system. The isolation device moves from the closed configuration to the open configuration in response to the heating element exceeding a second temperature limit.