PROBLEM TO BE SOLVED: To improve usability in carrying out handwriting input on a screen.;SOLUTION: In an electronic board system 20, when a series of handwriting input operation is performed on a plotting display screen 31 of a display unit 30, coordinates on the plotting display screen 31 of strokes S based on the series of handwriting input operation is acquired (step S100), and a plurality of strokes S spatially integrated on the plotting display screen 31 based on the acquired coordinates are grouped as one group (step S120). Bubbles B serving as a group identification display showing attribution to the group of the strokes S are displayed on the plotting display screen 31 (step S150).;COPYRIGHT: (C)2008,JPO&INPIT
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