PURPOSE:To maintain the order of process to one terminal, by providing plural terminals and a host computer and realizing an equal service to plural terminal with a small number of working sets in an on-line real-time system. CONSTITUTION:When input telegrams A1, B1, A2 and B2 sent from plural terminals T1-T2 arrive in that order at a terminal control part TCP, a process of stage ST1 is carried out for each of the telegrams A1...B2. Then the telegrams A1...B2 are cued in the execution queuing cue of a control block SCB2. In case a page fault arises while a process is carried out for the telegram A1 at a stage ST2, a program interruption is informed to a stage controller. The contents of the block SCB2 is kept at a working set W1 by the controller, and a busy state of the terminal T1 is written in a bit map BP of the terminal along with an application of a page load. Then a link from the block SCB2 to the set W1 is released, and the working set W2 is linked to the block SCB2 to perform an equal service to each of the terminals T1-T2.
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