Abstract: A facsimile device is linked to an external station via a telephone line in a data communication and processing system, the external station being one of a host computer and a fax server. The facsimile device includes an input unit which inputs image data containing task processing data and a kind of task. A recognizing unit recognizes the task processing data and the kind of task from the image data from the input unit, and converts the task processing data and the kind of task into code data. A facsimile communication unit transmits the code data from the recognizing unit to the external station via the telephone line by using a facsimile communication function, the facsimile communication unit receiving code data from the external station via the telephone line by using the facsimile communication function.

Abstract: A facsimile adapter unit which is coupled to a host system and a line and used for communicating between the host system and a station coupled to the line. The facsimile adapter unit includes a decoder for decoding image data which is transmitted from the station via the line and for outputting decoded image data, an error detection unit for detecting an error in the decoded image data, and a processing unit for sending the host system the decoded image data when the error detection unit does not detect the error in the decoded image data and, when the error is detected, for sending the host system information representing that an error is generated in the decoded image data instead of the decoded image data in which the the error is detected.