diff --git a/enjo_lib/comm/method/__init__.py b/enjo_lib/comm/method/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/enjo_lib/comm/method.py b/enjo_lib/comm/method/interface.py
similarity index 96%
rename from enjo_lib/comm/method.py
rename to enjo_lib/comm/method/interface.py
index 6f99cee..a7b51fc 100644
--- a/enjo_lib/comm/method.py
+++ b/enjo_lib/comm/method/interface.py
@@ -14,7 +14,7 @@ from typing import (
     TypeAlias,
 )
 
-from ..our_types import (
+from ...our_types import (
     JSON,
 )
 
diff --git a/enjo_lib/comm/internal.py b/enjo_lib/comm/method/internal.py
similarity index 96%
rename from enjo_lib/comm/internal.py
rename to enjo_lib/comm/method/internal.py
index c782d3e..f9a37aa 100644
--- a/enjo_lib/comm/internal.py
+++ b/enjo_lib/comm/method/internal.py
@@ -3,12 +3,12 @@ from __future__ import annotations
 import asyncio
 from functools import partial
 
-from .method import (
+from .interface import (
     MessageHandler,
     TransportMethod,
     TransmissionSuccess,
 )
-from ..our_types import JSON
+from ...our_types import JSON
 
 
 class InternalTransport(TransportMethod):
diff --git a/test/comm/method/__init__.py b/test/comm/method/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/test/comm/internal_test.py b/test/comm/method/internal_test.py
similarity index 97%
rename from test/comm/internal_test.py
rename to test/comm/method/internal_test.py
index 1650cc5..123e8d4 100644
--- a/test/comm/internal_test.py
+++ b/test/comm/method/internal_test.py
@@ -10,7 +10,7 @@ from unittest.mock import (
     MagicMock,
 )
 
-from enjo_lib.comm.internal import (
+from enjo_lib.comm.method.internal import (
     InternalExchanger,
     InternalTransport,
 )