PROBLEM TO BE SOLVED: To simply perform an operation test for all functions of a WEB application program distributed to a production environment server.SOLUTION: A WEB application test device acquires a list of screen program file names for an operation test and a list of error codes to be extracted from a program master storage section 202 and an error code master storage section 203 in a WEB application operation environment server 200. The WEB application test device uses the acquired screen program name as a target program for operation state detection, transmits an operation request of a WEB application program corresponding to the program name for the target of operation test to a WEB server 201 in a WEB application operation environment, and confirms whether or not response data from the WEB server includes the error code to be extracted. Thus, an operation state of the WEB application program is detected, and the operation test of the WEB application is performed.
