I know that SELECT @@version
gets the version of server.
But when SSMS booting, it shows SQL Server 2014.
I want to know what original version of SSMS what I am using.
UPDATES 1
As per Antonio Campagnaro
's answer, I got more confusion. See below image
SSMS (SQL Server Management Studio) is a program that can connect to a sql server instance. If you need to know what SSMS you are using you can find it in Help -> About..
If you need to know what sql server instance version you are using you can query SELECT @@VERSION
SSMS and sql server doesn't need to be the same version, but SSMS need to be higher than sql server