diff --git a/compiler/erg_common/config.rs b/compiler/erg_common/config.rs
index ebe08279..104bb1a5 100644
--- a/compiler/erg_common/config.rs
+++ b/compiler/erg_common/config.rs
@@ -132,6 +132,9 @@ pub struct ErgConfig {
     /// * 1: display errors and warns
     /// * 2 (default): display errors, warnings and hints
     pub verbose: u8,
+    /// needed for `jupyter-erg`
+    pub ps1: &'static str,
+    pub ps2: &'static str,
 }
 
 impl Default for ErgConfig {
@@ -155,6 +158,8 @@ impl Default for ErgConfig {
             input,
             module: "<module>",
             verbose: 2,
+            ps1: ">>> ",
+            ps2: "... ",
         }
     }
 }
@@ -203,6 +208,12 @@ impl ErgConfig {
                 "--mode" => {
                     cfg.mode = Box::leak(args.next().unwrap().into_boxed_str());
                 }
+                "--ps1" => {
+                    cfg.ps1 = Box::leak(args.next().unwrap().into_boxed_str());
+                }
+                "--ps2" => {
+                    cfg.ps2 = Box::leak(args.next().unwrap().into_boxed_str());
+                }
                 "-o" | "--opt-level" | "--optimization-level" => {
                     cfg.opt_level = args.next().unwrap().parse::<u8>().unwrap();
                 }
diff --git a/compiler/erg_common/traits.rs b/compiler/erg_common/traits.rs
index 5ff5d6b1..b3c40f05 100644
--- a/compiler/erg_common/traits.rs
+++ b/compiler/erg_common/traits.rs
@@ -324,23 +324,26 @@ pub trait Runnable: Sized {
     type Errs: MultiErrorDisplay<Self::Err>;
     const NAME: &'static str;
     fn new(cfg: ErgConfig) -> Self;
-    fn input(&self) -> &Input;
+    fn cfg(&self) -> &ErgConfig;
+    fn finish(&mut self); // called when the :exit command is received.
+    fn clear(&mut self);
+    fn eval(&mut self, src: String) -> Result<String, Self::Errs>;
+    fn exec(&mut self) -> Result<(), Self::Errs>;
+
+    fn input(&self) -> &Input {
+        &self.cfg().input
+    }
     fn start_message(&self) -> String {
         format!(
             "{} {SEMVER} (tags/?:{GIT_HASH_SHORT}, {BUILD_DATE}) on {ARCH}/{OS}\n",
             Self::NAME
         )
     }
-    fn finish(&mut self); // called when the :exit command is received.
-    fn clear(&mut self);
-    fn eval(&mut self, src: String) -> Result<String, Self::Errs>;
-    fn exec(&mut self) -> Result<(), Self::Errs>;
-
     fn ps1(&self) -> String {
-        ">>> ".to_string()
-    } // TODO: &str (VMのせいで参照をとれない)
+        self.cfg().ps1.to_string()
+    }
     fn ps2(&self) -> String {
-        "... ".to_string()
+        self.cfg().ps2.to_string()
     }
 
     #[inline]
diff --git a/compiler/erg_compiler/compile.rs b/compiler/erg_compiler/compile.rs
index 86d22b1f..b92a04e5 100644
--- a/compiler/erg_compiler/compile.rs
+++ b/compiler/erg_compiler/compile.rs
@@ -116,8 +116,8 @@ impl Runnable for Compiler {
     }
 
     #[inline]
-    fn input(&self) -> &Input {
-        &self.cfg.input
+    fn cfg(&self) -> &ErgConfig {
+        &self.cfg
     }
 
     #[inline]
diff --git a/compiler/erg_compiler/lower.rs b/compiler/erg_compiler/lower.rs
index 391c3124..164c20c1 100644
--- a/compiler/erg_compiler/lower.rs
+++ b/compiler/erg_compiler/lower.rs
@@ -41,6 +41,11 @@ impl Runnable for ASTLowererRunner {
     type Errs = CompileErrors;
     const NAME: &'static str = "Erg lowerer";
 
+    #[inline]
+    fn cfg(&self) -> &ErgConfig {
+        &self.cfg
+    }
+
     fn new(cfg: ErgConfig) -> Self {
         Self {
             cfg,
@@ -48,11 +53,6 @@ impl Runnable for ASTLowererRunner {
         }
     }
 
-    #[inline]
-    fn input(&self) -> &Input {
-        &self.cfg.input
-    }
-
     #[inline]
     fn finish(&mut self) {}
 
diff --git a/compiler/erg_parser/lex.rs b/compiler/erg_parser/lex.rs
index 440bb2f9..dfce853e 100644
--- a/compiler/erg_parser/lex.rs
+++ b/compiler/erg_parser/lex.rs
@@ -27,8 +27,8 @@ impl Runnable for LexerRunner {
     }
 
     #[inline]
-    fn input(&self) -> &Input {
-        &self.cfg.input
+    fn cfg(&self) -> &ErgConfig {
+        &self.cfg
     }
 
     #[inline]
diff --git a/compiler/erg_parser/parse.rs b/compiler/erg_parser/parse.rs
index 7adcb024..08cea8f8 100644
--- a/compiler/erg_parser/parse.rs
+++ b/compiler/erg_parser/parse.rs
@@ -178,8 +178,8 @@ impl Runnable for ParserRunner {
     }
 
     #[inline]
-    fn input(&self) -> &Input {
-        &self.cfg.input
+    fn cfg(&self) -> &ErgConfig {
+        &self.cfg
     }
 
     #[inline]
diff --git a/compiler/erg_parser/tests/parse_test.rs b/compiler/erg_parser/tests/parse_test.rs
index c22ebc47..49b6c5a0 100644
--- a/compiler/erg_parser/tests/parse_test.rs
+++ b/compiler/erg_parser/tests/parse_test.rs
@@ -53,6 +53,8 @@ fn parse_test_from_code(file_path: &'static str) -> Result<(), ParserRunnerError
         input: input.clone(),
         module: "<module>",
         verbose: 2,
+        ps1: ">>> ",
+        ps2: "... ",
     };
     let lexer = Lexer::new(input.clone());
     let mut parser = ParserRunner::new(cfg);
diff --git a/src/dummy.rs b/src/dummy.rs
index bac2cb1f..e5c272ff 100644
--- a/src/dummy.rs
+++ b/src/dummy.rs
@@ -4,7 +4,7 @@ use std::net::{Ipv4Addr, SocketAddrV4, TcpListener, TcpStream};
 use std::thread::sleep;
 use std::time::Duration;
 
-use erg_common::config::{ErgConfig, Input};
+use erg_common::config::ErgConfig;
 use erg_common::python_util::{exec_py, exec_pyc};
 use erg_common::traits::Runnable;
 
@@ -29,6 +29,11 @@ impl Runnable for DummyVM {
     type Errs = EvalErrors;
     const NAME: &'static str = "Erg interpreter";
 
+    #[inline]
+    fn cfg(&self) -> &ErgConfig {
+        &self.cfg
+    }
+
     fn new(cfg: ErgConfig) -> Self {
         let stream = if cfg.input.is_repl() {
             if !cfg.quiet_startup {
@@ -69,11 +74,6 @@ impl Runnable for DummyVM {
         }
     }
 
-    #[inline]
-    fn input(&self) -> &Input {
-        &self.cfg.input
-    }
-
     fn finish(&mut self) {
         if let Some(stream) = &mut self.stream {
             stream.write_all("exit".as_bytes()).unwrap();