Hi fatherprada,
thanks for reaching out.
I am going to assume that you are using AdSense here.
I would first try to find out what could influence the CPC. Are you showing the ad to different users or on different sites? Is the size different or does it only come down to a different position on the site?
You can also analyze the performance on both ads based on the location or device of the user in the AdSense reports.
I don’t think that just removing the ad with the higher CPC would help you much with the CPC of the other. I have seen this occasionally, but it was never proven to work long term.
Let me know when you find out more about the differences and I will see if I can come up with a specific advice.
Thomas