Digital input device, digital correction device and distance learning system

A digital input device comprising:

• a sensor which, in operation, detects an electronic pen and outputs coordinates according to a position pointed by the electronic pen;
• a display device disposed on a side of the sensor;
• at least one operation button;
• at least one processor;
• and
• at least one storage device storing at least one program that, when executed by the at least one processor, causes the digital input device to:
• display, on the display device, a predetermined template according to a format indicated by template data and inputted information according to the position pointed by the electronic pen and received via the sensor;
• provide timepoint information at each of a plurality of timepoints;
• generate a plurality of pieces of time-series data based on the timepoint information provided at each of the timepoints, each of the pieces of the time-series data including:
• a timepoint value indicated by the timepoint information,
• coordinate values indicated by the coordinates output from the sensor,
• a writing pressure value indicated by information received from the electronic pen, the writing pressure value indicating a pressure applied to the electronic pen in response to determining that the information indicates that the pressure is applied to the electronic pen, and the writing pressure value indicating that no pressure is applied to the electronic pen in response to determining that the information indicates that no pressure is applied to the electronic pen, and
• a button status value indicating a state of the at least one operation button;
• and
• store answer information and correction information in association with the template data indicating the format of the template, the answer information being different from the correction information, the answer information including the pieces of the time-series data in which the button status value has a first value, and the correction information including the pieces of the time-series data in which the button status value has a second value that is different from the first value.