My 9 year old son is starting to steal more and lying about It. It started out with stealing snacks and stealing things around the house. Recently,he took a classmate's Nintendo DS and lied and said he doesn't know what we're talking about. Before he came home from School his teacher called and said the student said my son was the only one who know he brought it to school. When my son came home, I didn't say anything I searched him and I did't find anything. A couple of days  later, I noticed my gum was missing out my room. I went to his room to search under his bed and guess what I found,the student's Nintendo DS.  After getting punished and all, I found out he has stole snacks again this Is so frustrating.

The schools says his has a behavior problem at School,but I was never seeing behavior problems at home until now.  It's getting worse and I think he needs help before it's too late. He is very loved,gets attentions,and wants for nothing. What could be the problem, any suggestions?