When I sync my iPhone 4 (iOS 7) with my computer, the iTunes does not show "iPhone" button right beside the "iTunes Store" button.

Also, iTunes does not detect any device connected to the computer.

Hi, Arthur330. 
Thank you for the question.  I am unsure if you are having the issue with your device not being recognized on a Windows or Mac computer so I will include the troubleshooting articles for both below.
iOS: Device not recognized in iTunes for Windows
http://support.apple.com/kb/TS1538
iOS: Device not recognized in iTunes for Mac OS X
http://support.apple.com/kb/ts1591
Cheers,
Jason H.

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