This is one of the limitations that the Premiere filter API has, which the After Effects effect API does not. Only AE-style effect plug-ins can provide drop-down menus in Premiere Pro.
Thank you for your prompt reply.
Could you tell me about How to add drop-down menu?
Do you have written in any document about "AE-style effect plug-ins" ?
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Yes, if you look at the After Effects SDK Guide PDF, chapters 1-3 and 5 describe AE-style effects that can work in PPro. Also, the Paramarama and Supervisor samples in the AE SDK have drop-down menus.
If you have any questions about the AE SDK, please post in this forum: http://forums.adobe.com/community/aftereffects_general_discussion/aftereffects_sdk