PURPOSE: To make a series of processing efficient with respect to coding data for size conversion of a transmission original and to reduce mount space and cost of relevant sections.

CONSTITUTION: A picture conversion processing integrated circuit device 11 is independent of a controller 1 of a facsimile equipment and receives code data from a data storage device 3 under the control of a control section 10 and uses a decoding section 4 to decode the code into picture data, a picture conversion section 6 converts the size and the result is coded by a coding section 8 and the code data are written in a data storage device 3.