PURPOSE:To perform DMA transfer efficiently by receiving a DMA transmission transfer permitting signal from an IP unit part, which is connected between a facsimile terminal and a host computer, by a communication processor after the end of DMA transmission and DMA-transferring picture information of the following page. CONSTITUTION:A connecting device between the host computer and the facsimile terminal consists of the communication processor and the IP unit part, and this unit part is provided with a DMA transmission transfer permitting signal generating means. Every one block consisting of parts F, M, and L of one-page components of picture information stored in the communication processor is transmitted to the IP unit part and is expanded and developed, and thereafter, a following page indicating command PMC is transmitted from the host computer to the IP unit part to store compressed picture information in the idle area of an image memory, and a DMA reception transfer request signal DR from the communication controller is received by the unit part, and the compressed information is transferred following a DMA reception transfer permitting signal PWK.
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