Auto renewal subscription (NIC) why costly

I have been using Norton products since long in Japan it had started with Boxed version which later turned to auto renewal and last night from Symantec store I got an e-mail that only few days has left in auto renewal (NIS) which also mentioned the cost in Yen.

I have noticed the cost of Boxed version is cheaper than this auto renewal cost and on internet I have read there is no more NIS.

My question what are the benefits of auto renewal than boxed version. Why boxed version is cheaper? And why Symantec store is calling it Norton Internet Security?

Please enlighten me and oblige.

Thank you