Patent ID: 8425328

Claim:
A terminal device ( 201 ) which is one a plurality of terminal devices ( 201 ) in a game system in which a plurality of terminal devices ( 201 ) forming a group share in the progress of a game, the terminal device comprising: a progress-degree storer ( 202 ) storing a degree of progress of the game; an input receiver ( 203 ) receiving input of an instruction operation from a player; a game progresser ( 204 ) progressing the game in which the progress is shared based on the instruction operation received; a progress-degree updater ( 205 ) updating the degree of progress stored in the progress-degree storer ( 202 ), wherein (a) the degree of progress continues over a time period from a finish of the reception of input of a certain instruction operation among the instruction operations to a start of the reception of input of the next instruction operation, and the degree of progress is updated to reduce a difference in the degree of progress stored in each of the plurality of terminal devices ( 201 ) belonging to the group; and (b) stopping the updating of the degree of progress over a time period from the start of the reception of input of the instruction operation to the finish of the reception for each of the instruction operations; and an image displayer ( 206 ) displaying a game image corresponding to the degree of progress stored.