PROBLEM TO BE SOLVED: To provide a software execution system that can reduce the manufacturing cost.;SOLUTION: The software execution system is so designed that a center side device 2 converts screen description information specifying an operation guide element to be displayed on the screen of a terminal device 3, and operation conditions defined in relation to the operation guide element and related to content of a directive operation performed with the related operation guide element, into directions for the terminal device 3, and transmits them; and that the terminal device 3 receives an input of a user's directive operation according to the directions received from the center side device 2, determines whether the content of the received directive operation conforms to the operation conditions included in the directions or not, and executes processing directed by the center side device 2 in dependence on the determination result.;COPYRIGHT: (C)2004,JPO&NCIPI
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