Patent ID: 7430677

Claim:
A data processing device which executes data processing based on input data and operates in either a power-saving state or an operating state, comprising: plural reception units, including a first reception unit and a second reception unit, adapted to receive the data, said plural reception units being in a first reception state in the case where said data processing device operates in the power-saving state and being in a second reception state in the case where said data processing device operates in the operating state; a data processing unit adapted to execute data processing based on the data received by said reception unit; a holding unit adapted to, in a case where a reception request of the data is input to either one of said plural reception units being in the power-saving state, hold reception factor information indicating which of said reception units receives the reception request; and a control unit adapted to execute control so as to shift the state of said first reception unit indicated by the reception factor information from the first reception state to the second reception state, and so as to, after starting the shift of the state of said first reception unit, start the shift of the state of said second reception unit from the first reception state to the second reception state, wherein said first reception unit requests a request source of the reception request to transmit the image data according to the shift of the state to the receivable second operating state, and receives the data transmitted in response to the request, and said data processing unit executes the data processing based on the data received by said first reception unit.