@startuml
hide methods
left to right direction
skinparam classAttributeIconSize 0

class DGS {
-Designation
-register SNSUser
}

class User {
-Name
-Password
-Email
}

class  SNSUser {
-CC
-Name
-PhoneNumber
-EmailAdress
-SNSNumber
- Date Birthdate
- String Sex

}

DGS "1" -- "*" SNSUser: Know >
SNSUser "0..1" -- "1" User : becomes >
@enduml