An apparatus for processing data, the apparatus comprising: a central processing unit; at least one memory unit configured to process a system data and a graphic data; and a memory controller coupled to the central processing unit and the memory unit, wherein the memory controller is configured to control an operation of a system in connection with at least one graphic controller and the memory unit by taking into consideration a graphic data usage of the memory unit or residual amount of battery power, wherein the memory controller comprises an Internal Graphic Controller, IGC; one External Graphic Controller, EGC, provided outside the memory controller, wherein the apparatus at least has the following modes: a first operating mode, wherein the graphic data are processed by using only the IGC; a second operating mode, wherein the graphic data are processed by using only the EGC; and a third operating mode, wherein the graphic data are processed by using both of the IGC and the EGC, wherein the operating modes are adaptively changed and set based on the check results of preset graphic data usage of the memory unit and/or the operating conditions/states of the system, wherein, if the amount of data processed or to be processed by the first operating mode exceeds 50% graphic data usage, the second operating mode is operated to process the graphic data, and wherein, if the amount of data processed or to be processed by the second operating mode exceeds graphic data usage of the EGC, the third operating mode is operated to process the graphic data, or wherein the operating modes are adaptively set based on a residual amount of battery power, wherein, if the residual amount of battery power of the first operating mode exceeds 50%, the operating mode is automatically switched to the second operating mode, and wherein, if the residual amount of battery power of the second operating mode exceeds 75%, the operating mode is automatically switched to the third operating mode. a central processing unit; at least one memory unit configured to process a system data and a graphic data; and a memory controller coupled to the central processing unit and the memory unit, wherein the memory controller is configured to control an operation of a system in connection with at least one graphic controller and the memory unit by taking into consideration a graphic data usage of the memory unit or residual amount of battery power, wherein the memory controller comprises an Internal Graphic Controller, IGC; one External Graphic Controller, EGC, provided outside the memory controller, wherein the apparatus at least has the following modes: a first operating mode, wherein the graphic data are processed by using only the IGC; a second operating mode, wherein the graphic data are processed by using only the EGC; and a third operating mode, wherein the graphic data are processed by using both of the IGC and the EGC, a first operating mode, wherein the graphic data are processed by using only the IGC; a second operating mode, wherein the graphic data are processed by using only the EGC; and a third operating mode, wherein the graphic data are processed by using both of the IGC and the EGC, wherein the operating modes are adaptively changed and set based on the check results of preset graphic data usage of the memory unit and/or the operating conditions/states of the system, wherein, if the amount of data processed or to be processed by the first operating mode exceeds 50% graphic data usage, the second operating mode is operated to process the graphic data, and wherein, if the amount of data processed or to be processed by the second operating mode exceeds graphic data usage of the EGC, the third operating mode is operated to process the graphic data, or wherein the operating modes are adaptively set based on a residual amount of battery power, wherein, if the residual amount of battery power of the first operating mode exceeds 50%, the operating mode is automatically switched to the second operating mode, and wherein, if the residual amount of battery power of the second operating mode exceeds 75%, the operating mode is automatically switched to the third operating mode.