Patent ID: 7877499

Claim:
A data processing apparatus comprising: an expansion interface to which at least one information processing device is connectable; a device identification information obtaining unit that obtains, an information processing device connected to the expansion interface of the data processing apparatus, first device identification information for identifying the information processing device; a data reception unit that receives first data from an external apparatus; and a data transmission unit that transmits the first data received by said data reception unit to the information processing device connected to the expansion interface of the data processing apparatus˜when the first device identification information obtained by said device identification information obtaining unit and second device identification information added to provided with the first data received by said data reception unit match each other; a data identification information obtaining unit that obtains, from the information processing device connected to the data processing apparatus, first data identification information for identifying data which the information processing device can receive as the first data, and wherein said data transmission unit transmits the first data received by said data reception unit to the information processing device connected to the data processing apparatus when the first data identification information obtained by said data identification information obtaining unit matches second data identification information added to the first data received by said data reception unit; and a comparing unit that compares each of the first device identification information and the first data identification information respectively obtained from the information processing device connected to the data processing apparatus with a corresponding one of the second device identification information and the second data identification information respectively obtained from a header portion of the data received by said data reception unit.