Image forming apparatus

1. An image forming apparatus comprising:

a receiving unit for receiving image information including first user information;

a processing unit for processing the image information received with the receiving unit;

a detection unit for detecting the first user information from the image information while the processing unit is processing the image information;

an input unit for inputting second user information while the processing unit is processing the image information;

a comparison unit for comparing the first user information detected with the detection unit with the second user information input through the input unit when the second user information is input into the input unit; and

a control unit for limiting an input through the input unit while the processing unit is processing the image information when the comparison unit determines that the first user information is different from the second user information.

2. The image forming apparatus according to claim 1 , wherein said control unit is arranged to invalidate the input through the input unit.

3. The image forming apparatus according to claim 1 , wherein said input unit is arranged to input a process, and said control unit is arranged to invalidate the process input through the input unit.

4. The image forming apparatus according to claim 3 , wherein said control unit is arranged to invalidate the process specified by a user.

5. The image forming apparatus according to claim 3 , wherein said control unit is arranged to invalidate the process specified by transmitted data from a user.

6. The image forming apparatus according to claim 1 , further comprising a display unit for displaying a state of the image forming apparatus, said control unit controlling the display unit to display a message indicating that the input is limited when the control unit limits the input through the input unit.

7. The image forming apparatus according to claim 6 , wherein said control unit is arranged to control the display unit to display a message indicating a reason for limiting the input.

8. The image forming apparatus according to claim 6 , wherein said control unit is arranged to cancel the limiting of the input.

9. The image forming apparatus according to claim 1 , wherein said comparison unit is arranged to compare the first user information of subsequent image information with the second user information of the subsequent image information to obtain a comparison result when the image information is processed, said comparison unit sending the comparison result to the control unit.

10. The image forming apparatus according to claim 1 , wherein said receiving unit is arranged to receive the image information including the first user information formed of a first user specific identification number, said input unit being arranged to receive the second user information formed of a second user specific identification number.

11. The image forming apparatus according to claim 1 , wherein said input unit is arranged to input a process, and said control unit is arranged to invalidate the process including a cancellation process of the image information.

12. The image forming apparatus according to claim 1 , wherein said input unit is arranged to input a process, and said control unit is arranged to invalidate the process including an editing process of the image information.

13. The image forming apparatus according to claim 1 , wherein said input unit is arranged to input a process, and said image information includes information for invalidating the process, said image forming apparatus further comprising a processing job operation invalidation information detection unit for detecting the information for invalidating the process from the image information, said control unit being arranged to limit the input through the input unit according to the information detected with the processing job operation invalidation information detection unit.