diff --git a/smnp/environment/environment.py b/smnp/environment/environment.py
index 32a009f..aec354a 100644
--- a/smnp/environment/environment.py
+++ b/smnp/environment/environment.py
@@ -1,4 +1,4 @@
-from smnp.error.function import FunctionNotFoundException
+from smnp.error.function import FunctionNotFoundException, MethodNotFoundException
 from smnp.error.runtime import RuntimeException
 
 
@@ -10,6 +10,14 @@ class Environment():
         self.customFunctions = {}
         self.callStack = [] #TODO remove
 
+    def invokeMethod(self, name, object, args):
+        for method in self.methods: # TODO to działa tylko dla wbudowanych funkcji
+            if method.name == name:
+                ret = method.call(self, [object, *args])
+                if ret is not None:
+                    return ret
+        raise MethodNotFoundException(object.type, name) # TODO method not found
+
     def invokeFunction(self, name, args):
         for function in self.functions: # TODO to działa tylko dla wbudowanych funkcji
             if function.name == name:
diff --git a/smnp/error/function.py b/smnp/error/function.py
index c622f2b..3904a09 100644
--- a/smnp/error/function.py
+++ b/smnp/error/function.py
@@ -9,3 +9,8 @@ class IllegalFunctionInvocationException(SmnpException):
 class FunctionNotFoundException(SmnpException):
     def __init__(self, function):
         self.msg = f"Function '{function}' not found"
+
+
+class MethodNotFoundException(SmnpException):
+    def __init__(self, object, method):
+        self.msg = f"Method '{method}' of type '{object}' not found"
\ No newline at end of file