PURPOSE: To mechanize a seal pasting work by changing the digit of a digital card displayed on a digital display via an instruction inputted from a digital input machine.

CONSTITUTION: A digital reader 2 reads digits on a digital card by stroking the digits with the lower end thereof and inputs the digits so read to a digital display 1. When a game starts and a host begins to read a digits, participants press the buttons of a digital input machine 3 in hand. For example, when the host announces the digits '42', the participants input the same digits by pressing the buttons of the machine 3. The indication of the display 1 for a position corresponding to the digits '42' changes consequently. Thus, any digits inputted, can be grasped at a sight from the display 1. Thereafter, a similar work is continued and repeated until the end of the game. In addition, the digital display 1 is fitted with a connector 4 for connection to other digital displays, and a plurality of such displays can be arranged for a game.