diff --git a/emul_repl.c b/emul_repl.c
index 16a30d1..55897ed 100644
--- a/emul_repl.c
+++ b/emul_repl.c
@@ -10,19 +10,41 @@
 
 static WINDOW *win;
 
+
 void emul_repl_readline(char input[READ_LINE_MAX]) {
     static int current_line = 0;
     int history = 0;
     int c;
     int i = 0;
     int y, x;
+    void emul_repl_show_history() {
+	int max_y, max_x;
+	input[0] = '\0';
+	emul_inst_dec_get_line(input, current_line+history);
+	getyx(win, y, x);
+	// 1行削除
+	move(y, 0);
+	clrtoeol();
+	// ヒストリ番号表示
+	getmaxyx(win, max_y, max_x);
+	move(y, max_x-8);
+	printw("L[%5d]", current_line+history);
+	// ヒストリ表示および格納
+	move(y, 0);
+	printw(">>");
+	i = 0;
+	while ( input[i] != '\n' && input[i] != '\0') {
+	echochar(input[i++]);
+	}
+	refresh();
+    }
     current_line = emul_inst_dec_get_program_line_max();
     printw(">>");
     refresh();
     noecho();
     cbreak();
     while( (c = getch()) != '\n' ) {
-        if (c == 127) { // Delete and back
+        if (c == 127 || c == KEY_BACKSPACE) { // Delete and back
             if ( i > 0 ) {
                 getyx(win, y, x);
                 input[--i] = '\0';
@@ -33,32 +55,12 @@
         } else if (c == KEY_UP) {
             if (current_line+history > 0) {
                 history--;
-                input[0] = '\0';
-                emul_inst_dec_get_line(input, current_line+history);
-                getyx(win, y, x);
-                move(y, 0);
-                clrtoeol();
-                printw("%d>", current_line+history);
-                i = 0;
-                while ( input[i] != '\n' && input[i] != '\0') {
-                    echochar(input[i++]);
-                }
-                refresh();
+		emul_repl_show_history();
             }
         } else if (c == KEY_DOWN) {
             if (current_line+history < current_line) {
                 history++;
-                input[0] = '\0';
-                emul_inst_dec_get_line(input, current_line+history);
-                getyx(win, y, x);
-                move(y, 0);
-                clrtoeol();
-                printw("%d>", current_line+history);
-                i = 0;
-                while ( input[i] != '\n' && input[i] != '\0') {
-                    echochar(input[i++]);
-                }
-                refresh();
+		emul_repl_show_history();
             }
         } else if (c == KEY_RIGHT) {
             // Nothing do