A timing controller includes an interface controller that reads out a current identification code and current address information of the current identification code. A data comparator compares a previous identification code stored in a memory provided in the timing controller with the current identification code. If the current identification code is different from the previous identification code, the interface controller reads out current parameter data corresponding to the current identification code from the memory and a data processor processes image data by using the current parameter data. The timing controller recognizes the update state of the parameter data stored in the memory and processes the image data by using the updated parameter data.