diff --git a/SMILEBASIC/main.d b/SMILEBASIC/main.d
index bdd72d0..d585f69 100644
--- a/SMILEBASIC/main.d
+++ b/SMILEBASIC/main.d
@@ -3,10 +3,8 @@ import otya.smilebasic.parser;
 int main(string[] argv)
 {
     writeln("Hello D-World!");
-    auto parser = new Parser("1+2*(3+4)");
+    auto parser = new Parser("ADD(ADD(1,2,3,4,5,6),2,3,4,5,6)");
     writeln(parser.calc());
-    writeln(1+2*3+4);
-    writeln(1+2*(3+4));
     readln();
     return 0;
 }
diff --git a/SMILEBASIC/node.d b/SMILEBASIC/node.d
index 7ff592c..bc11c26 100644
--- a/SMILEBASIC/node.d
+++ b/SMILEBASIC/node.d
@@ -1,12 +1,17 @@
 module otya.smilebasic.node;
 import otya.smilebasic.type;
 import otya.smilebasic.token;
+import std.container;
+
 enum NodeType
 {
     Node,
     Expression,
     Constant,
     BinaryOperator,
+    Variable,
+    CallFunction,
+    VoidExpression,
 }
 abstract class Node
 {
@@ -49,3 +54,34 @@ class BinaryOperator : Expression
         this.item2 = i2;
     }
 }
+class Variable : Expression
+{
+    wstring name;
+    this(wstring n)
+    {
+        this.type = NodeType.Variable;
+        this.name = n;
+    }
+}
+class CallFunction : Expression
+{
+    wstring name;
+    Expression[] args;
+    this(wstring n)
+    {
+        this.type = NodeType.CallFunction;
+        this.name = n;
+        args = new Expression[0];
+    }
+    void addArg(Expression arg)
+    {
+        args ~= arg;
+    }
+}
+class VoidExpression : Expression
+{
+    this()
+    {
+        this.type = NodeType.VoidExpression;
+    }
+}
diff --git a/SMILEBASIC/parser.d b/SMILEBASIC/parser.d
index 11b2be3..d499a7d 100644
--- a/SMILEBASIC/parser.d
+++ b/SMILEBASIC/parser.d
@@ -23,6 +23,7 @@ class Lexical
         table['/'] = TokenType.Div;
         table['('] = TokenType.LParen;
         table[')'] = TokenType.RParen;
+        table[','] = TokenType.Comma;
     }
     bool empty()
     {
@@ -56,6 +57,21 @@ class Lexical
                 token = Token(TokenType.Integer, Value(num));
                 break;
             }
+            if(c.isAlpha())
+            {
+                wstring iden;
+                for(;i < code.length;i++)
+                {
+                    c = code[i];
+                    if(!c.isAlpha())
+                    {
+                        break;
+                    }
+                    iden ~= c;
+                }
+                token = Token(TokenType.Iden, Value(iden));
+                break;
+            }
             if(table[cast(char)c] == TokenType.Unknown)
             {
                 //error
@@ -173,6 +189,22 @@ class Parser
                     }
                 }
                 break;
+            case NodeType.Variable:
+                return 100;
+            case NodeType.CallFunction:
+                {
+                    auto func = cast(CallFunction)exp;
+                    int result = 100;
+                    if(func.name == "ADD")
+                    {
+                        result = 0;
+                        foreach(Expression i ; func.args)
+                        {
+                            result += calc(i);
+                        }
+                    }
+                    return result;
+                }
             default:
                 return - - -1;
         }
@@ -224,6 +256,35 @@ class Parser
                 version(none)stdout.flush();
                 node = new Constant(Value(token.value.integerValue));
                 break;
+            case TokenType.Iden:
+                if(!lex.empty())
+                    lex.popFront();
+                if(lex.front().type == TokenType.LParen)
+                {
+                    auto func = new CallFunction(token.value.stringValue);
+                    node = func;
+                    //関数呼び出しだった
+                    while(true)
+                    {
+                        lex.popFront();
+                        token = lex.front();
+                        
+                        if(token.type == TokenType.Comma)
+                        {
+                            func.addArg(new VoidExpression());
+                            lex.popFront();
+                            token = lex.front();
+                        }
+                        else
+                        func.addArg(expression());
+                        if(lex.front().type == TokenType.RParen) break;
+                    }
+                }
+                else
+                {
+                    return new Variable(token.value.stringValue);
+                }
+                break;
             case TokenType.LParen:
                 lex.popFront();
                 node = expression();
diff --git a/SMILEBASIC/token.d b/SMILEBASIC/token.d
index f7252e8..2efc607 100644
--- a/SMILEBASIC/token.d
+++ b/SMILEBASIC/token.d
@@ -18,6 +18,8 @@ enum TokenType
     If,
     LParen,
     RParen,
+    Iden,
+    Comma,
 }
 
 struct Token