An information processing apparatus obtains a plurality of messages transmitted between a client and a server, each message including at least one of a plurality of parameters and a value of the parameter. The information processing apparatus detects a parameter having different values set in different messages among the obtained plurality of messages, from among the plurality of parameters. According to the detection result, the information processing apparatus determines a rewrite parameter whose value is rewritten when using the plurality of messages for verification of a server, among the plurality of parameters.