To efficiently display information for an object two-dimensionally, a two-dimensional pattern 50 is displayed in a two-dimensional tag. The pattern comprises a first region 52 consisting of a locational reference region 60 that is square and located in the center of the first region 52 for identifying the location and an identification region 62 that surrounds the locational reference region 60 and is a single data cell, a second region 54 in which a black pattern and a white pattern appear alternately for identifying the starting location for reading information, and a third region 56 for displaying coded information about the object. Detection of the square region in the first region 52 allows detection of the location of the two-dimensional tag in which the two-dimensional pattern 50 is displayed, while detection of the data cell of the second region 54 in which black and white appear alternately allows detection and correction of the location of the two-dimensional tag. This constitution enables effective use of the outer circumference in which much information can be displayed.
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